Any human is a human with potential to do bad things. And good things.
Seems rather obvious.
Imagine any action a human could engage in.
That's potentially an action you could do, being a human and all.
This largely sums up my beliefs.
"Every man is a rapist" is true, but, even as women, I do find the statement problematic because it, for lack of better term, is promoted. To me, it just breeds fear. Like it or not, such phrases, if parroted enough, can color the way we view our world and the individual in it. It would be like promoting a statement such as "every Muslim is a potential terrorist". True, but, while in this very brief span of time much terrorism may be linked to Islamic extremism (or at least the terrorism the media reports), this does mean such was true in the past, nor will be in the future, nor is terrorism always fueled by Islam (or any religion) now. A virtually infinite number of "every (insert people group) is a potential (insert undesirable)" could be composed, with some level of accuracy.
Yes, we need to recognize this world is not always a pleasant one, but not at the expense of any individual group. People, and the decisions they make, are the problem, not men, women, Muslims, Christians, atheists, blondes, the obese, or anything else. Whether or not absolutely every individual has the capacity to commit every act of wrong (that is, the impact of environment) is a complex topic best left for experts, I think.