There is one more flaw to the invasive species thing. It's all in the BOA CONSTRICTOR...
Boa constrictors have lived right by us for years! They have never crossed the border and joined us! Why? Too cold!! They like where they live. Boas actually can be naturally found about 100 miles south of the US! So why haven't they already taken over? :D
I know that the the cats around my neighborhood kill more in a week than a python would kill in...well, quite a while. My neighbors cat brings home dead animals every day. And that's just stuff he brought to the owners, who knows what things were killed 'for fun' that the cat got bored of/already ate?
And I love cats, don't get me wrong! But comparatively, they are a much bigger problem than the snakes.
But you know, people aren't afraid of cats! Most people anyway.