PETA does not release lab animals, that'd be ALF. Animal Liberation Front.
Some people seem to get confused about this. ALF is the group that engages in illegal activities.
Learning to drink water from a pool is going to the least of the concerns when releasing large amounts of fur rasied or lab animals. Not that I'd endose these activites, just saying...
Vegetarianism is better for the enviroment because plant agriculture use less resoucres then animal agriculture. This is well proven and you can find the facts in other sources besides PETA. My personal thoery is if you are sustenance hunting, then this would be the exception to this rule.
Needing meat is debatable. Gorillas have these sorts of teeth too. At any rate, most people agree that if any meat is needed, it is very small amounts and our species is basically vegetarian. Like a pleco that eats mostly plant matter and might eat meat once in a while.
Wolves are not closely related to people for you to model your diet after them.
If you truly believe you need to eat like a wolf, then by all means run into the forest with a bunch of people, run down another animal and start "wolfing" down raw meat with your "canine" teeth". I'm guessing your weak people teeth would be unable to piece a deer's skin.
As for the animals died to harvest plant based foods, this is entirelly true.
But when you eat factory farmed raised meat, more grain had to be indirectly raised so you could have this meat. Despite that something often "had" to die for a vegetarian diet, it is still going to be less then a meat based diet because of the amount of grains you need to raise animals for meat. Hunting would be different because you wouldn't be raising crops to feed the animals, would be interesting to compare impacts of animals killed in hunting VS animals who are killed to harvest crops.
As for radicals being clueless about the enviroment: I'm assuming you meant PETA members here?. I would say that people with radical beliefs come from all walks of life. Some are highly educated, some are not.
Both liberal and conservative people can fall into either catergories as well as wide ranges in between.