Dunno if it was okay that time either. I wasn't there. And I didn't vote for Johnson. But it's not a very common move. Or a particularly good look. (That whole Second Amendment to avoid government tyranny stuff.)
Should be a last resort, not something you deploy after a few days. Think he got a bit trigger-happy to make a show of strength, but it could well "backfire". Having to use the National Guard or Marines on your own population (yes, some people there are US citizens too) to quell a bit of civil disorder could be misinterpreted, as though he's lost control of his own country/people. (Well, I'm pretty sure he's already saying that about the governor anyway.) That's arguably the kind of thing a place like Putin's Russia would do. France has riots all the time but I don't think they send the troops in just like that.