[Shadowstrike]

I never said that people shouldn't keep their pets under control. I merely stated that no one -no one should be shooting a cat for doing what Cats do. I will agree that the natural balance is off in a great many ways, but killing an animal that is doing 'animal things' does not entitle anyone to kill said animal. And once upon a time neither dogs nor cats were 'domesticated' if you have a problem with this, I strongly suggest you build a time machine go backwards and beat the stuffing out of the first 'people' who domesticated them. Enough said on this subject.

[Plateau]

Sorry, but I cannot even contemplate your reasoning! If a tiger escapes from a zoo, should we just allow it to roam free and eat people? It is only doing what an animal does! Here are just a few of my list to get rid of in North America.
Feral Cats (never happen but keep trying)
Nutria (possible)
Brown trout (never happen but keep trying)
Common Carp (never happen but keep trying)
Kudzu (never happen but keep trying)

These are just a few that are non-native to North America.