Your words are you think cooperation is better than competition, my answer to it is: OK, but do not even think of forcing cooperation upon me, that will not end well.
Everybody competes. Communism is exactly as evil as fascism since both are collectivism forms that require destruction of the individual freedom, individual choices and individual ownership and operation of property so that the mob is getting the benefits supplied by those who can produce more. The ones producing more are absolutely willing to trade. Trade for the productive output of others and if they want to be charitable it is their choice. But nobody under any circumstances should ever for any reason be forced to support anybody, be forced into any form of collectivism at all, regardless of whatever the intentions may be of the collective. The collective must never be allowed above any individual, that is the point of individual freedom. That is why people ran away from their oppressive governments to the USA. That was what made USA unique.. But today the US is no different and in many cases even worse than many other countries in that respect.
If you want to cooperate with others, you have plenty of ways to do it. Start your own partnership, do whatever you want as a group of like minded individuals.
But that is not your desire. Your desire is not cooperation of like minded individuals. It is oppression of everybody under your favorite form of collectivism. You will never have me join on my own accord, so you want to force me to join so that I can be brought down to your level and oppressed by your violent political structure. The answer is no.
Can you give an example of a negative outcome?
A step-parent relationship is legally the same as an adoption here. The only reason to perform a step-parent adoption is to block birth-parent visitation. So step parent adoptions are rare. But, marriage to the parent of a child is the equivalent. One is the legal guardian of the children in the relationship, regardless of blood. So, if the birth parent in the married couple dies, the child's care is uninterrupted. The surviving parent is sole guardian, and legally the parent, unless the other birth parent had some formal custody, or wishes to pursue it.
But living together without marriage? The child of a sole-custody arangement is an orphan the same as if both parents died, and the non-married non-birth parent is treated as if a neighbor walked up after a car crash that killed both parents, and offers to look after the new orphans.
I am speculating that you think there are negative consequences to laws such as family law due to same-sex marriage
You should not rush to judgement.
Think about it for a minute - what actual, tangible, benefit do gays achieve by being able to call their relationships a marriage?
Do you want a list of the thousands of rights that come with marriage? The rights of survivorship are ignored by almost all, at least until their spouse dies suddenly, and they have to take over the life. When my dad died, I could have sued his partner for her house. They weren't "married", but had lived together for 10+ years, and lived as man and wife. As he made tangible improvements to the property, and as I'm his son, I have a right to whatever holding he had in that property. Since he wasn't married, I could claim against that as his heir. If they had been married, then I'd have had no claim. It would have passed to his wife without claim or ability for incident.
That's one of the thousands of rights that married people take for granted. In most cases, even a written living will is trumped by the "marriage" card. Though, that's changing. But a non-married partner will be ignored by all. And that's not changing.
of course most have little interest in real human rights - just ask around here about people's views on abortion for example.
Since someone doesn't agree with your fascist declaration of when life begins, you assert that their value of life is different. Nah, you are just a fascist aggressor who hates people.
The law could very simply state (all laws regarding marriage are null and void. from this day forward the laws are as follows....
Yeah, and so the one law passed to do that is in what jurisdiction? Federal? They don't define "marriage" now, but put rules on it based on what the 50 states decide. So at a minimum, you'd have to have 51 states (DC is a "state" for most purposes), plus the feds, and get that 52 law bundle passed at the exact same instant for that to work. Plus, the "laws" in many places aren't laws, but regulations and administrative rules. Your "simple" law would have to change the IRS code, and hundreds or thousands of other federal regulations with weight of law. And the countless local rules on marriage. State law in Texas allows a minor to drink, under the supervision of an adult. So a 21 year old married to a 19 year old, can buy drinks for, and hand drinks to the "under-age" drinker. But that's not the same everywhere. Thousands of little things like that would make a massive change to the legal burden of formerly married people, once you abolish marriage, in the way you state.
You obviously don't even understand that, let alone have an opinion how it would work after. How does your one simple law fix under-age drinking law in Texas (a state matter) and the IRS code (not coded into law), at the same time?
"One simple law" change for multiple independent jurisdictions. With no understanding of law, or reality.
For God's sake, stop researching for a while and begin to think!