Can you provide some examples of who it is that denies Economics or Human Nature and what it is that they deny about those fields of study?

I think XKCD summarizes the topic pretty well:
http://xkcd.com/154/

"A million people can call the mountains a fiction, yet it need not trouble you as you stand atop them"
"But he's a US Senator!"
"Ah. Then yes, we do have a bit of a situation."

Even worse is the contradiction between his denial of Global Warming and his stated position of "stronger national defense". The Pentagon acknowledges that Climate Change poses threats to national defense as an "accelerant of instability and conflict."
http://www.scientificamerican.com/article.cfm?id=us-military-forges-ahead-with-plans-to-combat-climate-change

"Dwarf Planet" could be a cool name for a sci-fi sequel to "Dwarf Fortress".

"Man shoots own son in 'burglary'
A US man mistakenly shot dead his 15-year-old son while investigating what appeared to be an attempted burglary next door, police say." http://www.bbc.co.uk/news/world-us-canada-19756499

If only his son was carrying a gun amirite!?!

I completely agree and it is beyond frustrating how gun nuts fail to understand the obvious.

What you hear is true.
As someone who has played all 5 of the Civilization games to-date I have to say that they've streamlined the game.
I've always loathed the process (in Civs 1 - 4) of naval invasion. It's my least favorite part of those games.
In Civ 5 they have removed *most* of the hassle of naval invasion. You don't have to build transports. You just send your unit to the coast and say "embark" and a transport appears out of nowhere to carry the unit across the water.

When I look up in the sky I do not want to see 'Urrectum'*!

* I propose that if NASA must name things based on the most popular choice then eventually there will be a celestial body named Urrectum. It is inevitable.

Now we know which plane Mourns-For-Trees comes from.

As a layman I say that "I believe in science".
By saying that I do not mean to belittle science.
By saying that I do not mean to create a false equivalency between the epistemologies of 'empiricism' and 'divine revelation'.
When I say that "I believe in science" it is only because I am not familiar enough with the details of scientific theories nor the volumes of evidence to make the claim that I "know" it.

To be clear:
I would not argue if a Biologist said "I know the theory of Evolution", but I only feel comfortable saying that "I believe the theory of Evolution".
I would not argue if a Physicist said "I know the theory of Relativity", but I would only feel comfortable saying that "I believe the theory of Relativity".
I would not argue if a Climatologist said "I know the theory of Climate Change", but I would only feel comfortable saying that "I believe the theory of Climate Change".

I ask myself a very similar question every time I see some internet know-nothing claim that the scientific theory of Global Climate Change is a hoax/fraud/scam.

Oooh that's a Godwin.
Stay classy "skeptic"!

I think pretty much everyone already does blame "the person" in tragedies like this. That's why (if he was still alive) "the person" would be convicted and imprisoned.
Nobody has ever suggested putting his gun on trial. Nobody has ever suggested imprisoning his gun.
The culpability for the shooting has always been on "the person".

What some people, like myself, have noticed is that there are other people out there who are like "the person". They have similar mental disorders and they also have access to similar arsenals of assault weaponry.
Blaming "the person" is not enough. It does not solve the problem of all the other nut jobs out there.

When I ask gun-nuts whether the 2nd Amendment means civilians should have access to military grade weaponry (RPGs, anti-air craft guns, surface-to-air missiles, armor piercing rounds, high explosives) they usually say "no" (an occasion gun-super-nut will say "yes").
Thanks to your comment I now know that gun-nuts are lying and that they actually do want military grade weaponry in civilian hands.

... There: Now I don't actually believe that, but I've written it out anyway to show how easy it is to make the slippery-slope slide in the other direction.

I was going to ask exactly the same question!
When I imagine myself buying a plane ticket and sales person asks for my credit card *before* they have given me a price-quote: I'm going to be suspicious.
"Why do you need my credit card? I haven't told you where I'm going and you haven't told me how much it will cost."