Sometimes it's just fun to haul a small tree around: it builds muscle, burns calories, and counts as exercise, so what's not to like? Seriously, it's not just dudes: I didn't think this woman was carrying a purse, but maybe that's because I don't carry one, either.
The last time I did with any regularity might've been 2010 or '11, and at the stupid job I had (I've had a few of these) they made you stow them under the front counter - not locked up. The employees, not to mention the clientele, seemed a bit dicey to risk my purse with, but within a month or two I was out of there and never carried one again, except for the rare times I need to and don't have to risk leaving it anywhere stupid, like at that job.
Leave-purse-at-counter job was one of multiple places - not the last - where using the front counter (or at best, a stockroom with public restroom access) was your only option because there were no lockers, no breakrooms and it was that or leave your personal effects in your vehicle. But it was by far the seediest. And I haven't exactly spent my life working in five-star venues, so that might be saying something.
Not carrying a purse in general started when I was in my late 20s or early 30s, sometime after my mom and I agreed - likely not for the first time - that purses are just plain tremendously stupid. She stopped carrying one more or less the same day, but it took me another 10 or 15 years to pretty much ditch them, altogether - but I'm getting there.