Never had any interest to own any venomous snakes myself, so I can't answer you as to what the attraction is. Maybe some people get a thrill out of cheating death every time they handle them.
I've seen some people do pretty stupid stuff with handling venomous snakes that they were just lucky to not get bit. And yeah, I'm all for people's freedoms as much as the next guy, but honestly, I don't think I could come up with a convincing argument about why someone MUST have one, besides just the fact that they WANT it. But living in an apartment complex or really near anyone who could get bitten by an escapee, well, that then becomes a tough argument to defend.
Heck, here's a pic of the fangs of a Gaboon viper, and then a pic of what I believe is the results of a bite on someone's leg. Not anything I would want to be messing around with.
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