I don't mean to be ugly about it, but in some neighborhoods it's a legitimate thought.
I just gave more thought to this - this morning; funny because about an hour after I thought of this - I saw the two squirrels on our back deck....any way there are a couple of guys that I could see doing this now that I think about it.
The two live across the street from one another - they both have families - and the odd thing is they are both sort of stay at home dads. One his girls are older like mine - in college and a senior in high school so they don't really need him at home. He seems nice enough but he is an odd bird. He basically lives in his garage. The wife works at the same company as me, but he just "works" in his garage - I am waiting for some day when a rocket lifts off from his garage. Who the heck knows what he is building in there. Yeah I could see him not poisoning the creatures, but actually shooting them.
The other I do not know as well - his kids are younger in grade school. The two seem to buddy up alot during the day -- join each other and smoking and chit chatting - not sure where he gets the money - but he has these souped up cars. It seems like he works on his cars as his hobby but does not work - they obviously have money from somewhere because there are contractors over his house doing lots of work on it. Yeah he seems a bit rough around the edges - I could picture him poisoning squirrels. I could envision some getting into his garage and him setting out poison to keep them out.
We have gotten them in our garage - we found the small spots they could get in and just plugged up the holes - I think only the smaller red squirrels can manage to get in now and we don't get many of those.