What are some of the resons that humans would kill black bears?

Absolutely. There have been several reported cases of humans falling victim to black bears.

Grab the neck or shoulder and shake violently. That's how they kill seals, so it would be the same with a human. But normally a polar bear wouldn't kill a human for meat unless it was starving or the...

well...to kill a black bear.you have to shoot it or kill it with a machette..

No. A grizzly bear is more likely to kill a black bear if they cross paths than a black bear killing a grizzly. A male black bear may kill young grizzly cubs if he comes across them, and the same if...

It's likely, but in most cases prefer to leave humans alone and avoid them rather than go out and kill them.