WTF have you been smoking?
Reality. What have you been snorting where you don't realize this has been happening? You can be fined for it. That environmentalists push for it. That the favorite blame game is "Monsanto". That the brainchild was the environmentalism of the 70's and 80's, and is such a bad problem that provinces and states now actively encourage planting it. Want to bury your head in the sand? Feel free. The reality is far different, and is probably one of the best examples of environmentalism running amok to the point where it actively damages the environment. Hell if you dig hard through provincial records for example here in Ontario from the 1980's you can find environmental groups actively pushing for the use of broad-spectrum herbicides in order to control particular plant species and stating that the destruction and loss of native species outweighs the bad in controlling others.
A few reports of particular cities banning weeds over a certain height does NOT support your claim that not more than a year or two ago in most North America you could be fined for growing milkweed. And no support for "environmentalists pushing" for such weed laws.