Bear, easily.

A couple minutes of searching the web, you'll find some variance in the stats, but the general notion is that bears don't seem to be as dangerous as we portray them to be. The data aggregated here suggests that there were 48 fatalities in North America, in the span of 17 years. A few other places claim there have only been around ~180 bear fatalities in NA since the late 1700s, but I couldn't find any definitive sources, so take those with a grain of salt.

Bear in mind, this factoid isn't something we can stack up against men to answer this question, we don't encounter bears with the same frequency or density that we do people, nor do bears have the same nature or motivations as humans, but it's something I found along the way that I thought was interesting, and at least lends some credence to the idea that if you leave a bear the fuck alone, it will probably leave you the fuck alone.

On the back of that detour, I did a separate search, looking at the latest murder statistics I could find in the US. (Again, forgetting the bear stuff, making a different point here)

Personally, I found the data disturbing, 10,335 murders perpetrated by men in a single year, 7x that of women. Other violent crimes like rape are also tracked, albeit without offender sex, of which there were 122,822 in the same year; in a relatively "safe" country. If you look at it in relation to the entire population of ~328 million (at the time) you may be inclined to say "it's not that many" or "it's just a minority of men" (duh), but fellas... as someone with a dick and balls like you, I've never sat down and thought to myself "You know what sounds great right now? A good raping.", and I'm sure the majority of you haven't either, 1,000 rapes a year is too many, Nearing 123,000 is fucking egregious.

When I look at numbers like that, it's apparent to me that people are capable of being selfish, violent, motherfuckers in ways that some random bear in the forest never could. And unfortunately, men are overwhelmingly the perpetrators of that violence. If you take offense to that fact, and aren't an awful person yourself, then you need to wake the fuck up and take a look around. No one's accusing you specifically of being a rapist or a murderer, but there's a non-negligible trend here, and an uncomfortable truth that has yet to be sufficiently addressed; and that's the whole point of this thought experiment in the first place.

Edit 2

After receiving a few comments with similar criticisms, and after some additional reflection on what I initially wrote, I reworded and reorganized a solid chunk of this post to, I hope, clarify what my views are, include additional context, and ensure that people are clear that the two points of data (ie. bear fatalities and murder rates) are not intended to be compared, but rather they individually address separate statements I've seen echoed throughout this thread. My position hasn't changed, the conclusion hasn't changed, but hopefully this comes off a bit less inflammatory and more intellectually honest than before, it's not my intention to mislead anyone; just to get the cogs turning.