100000x NO
I don't care how bad it's been for humanity right, because it's worser hundreds or thousands of years back. At least in modern days, people can make polls about "would you destroy humanity" without getting their tongues cut, repeatedly flogged with rusty iron-tipped whips, then put to death via mutilation.
Back then, they have problems with smallpox, now it's nonexistent. Today, we have problems with pollution, global warming, etc. Tomorrow, some dude (you may have killed if you choose to kill humanity) may have found a way to help eliminate those. It takes life for progress, not death.
I'm no fan of even eliminating certain "unsavory" groups in humanity, as even in those groups, there are a few decent dudes that may do good for society. Heck I'm not a fan of killing certain people either, whether their intent may be good or bad, as some of them, or maybe the son or daughter of any of them (or even one of their sons or daughters), might be born one day to invent a way to cure AIDs, turn a third world country into a first world country, saved a few lives as a doctor or nurse, or be the person who helps the guys who do, like be that carpool dude that helped make the other person's life easier, or be that maintenance dude that cleans your crap up and make the whole place disease free for you to thrive in.
Heck no matter what little reason, you don't know that that grumpy bastard at the apartment above you actually gave $10,000 of his retirement fund to charity for the blind or something. If you choose to destroy humanity, it's one big major fuck up for both you and for all humanity to even think of choosing to destroy their own kind, as you killed a lot of people who has more right to live than you do, you sick, genocidal bastard
