I was mostly staring at the "snake food" part. But still, I think it would have been more humane to let your cat (assuming he/she doesn't play with his/her food) get them. or just use mousetraps. Hmm, but then, I guess that cat might get caught too...
I think even vermin (including cockroaches, which I really hate) deserve humane deaths or death from predation. That's why I don't believe in poisoning mice and rats; the poisons are hemotoxins which cause them to die from extreme hemorraging.
Do you have any idea where the toilet leads too?! Sewage treatment plant. pretty much why I wouldn't flush my bettas down the toilet after they died. I put them into a peaceful little creek.