i would certainly be more perplexed by a human just existing out there

In this scenario you are also “just existing out there.”

Could be your local mountain man out there just vibin on his own time, could be your local serial killer up to some shit, who knows!

And that is the entire point. The article didn’t say “any man” it said “a random man”. Could go either way, who knows? With the bear it’s far more certain it just wants to leave you alone.