That's one of their only possible tactics, so yeah, it's quite likely!
But one thing to remember is in a group of millions of people, like the protest on Saturday, there will be bad apples. It's just statistics. You can't have that many people together without somebody being messed up in the head, or unstable, or having a really bad day, etc. So shit will always happen when moveents get bigger than a few dozen people. This is millions. If somebody brings guns, peacefully I mean, I would not be surprised. If somebody wears armor, I wouldn't be surprised. But this has to just stay peaceful, and I'd rather see zero armed out of the millions, even though I know that's not likely. Especially now with the official declaration of martial law, people are going to be expecting the worst. It's hard not to react when you're threatened by a bully. I've had a lot of personal experience, maybe I'll be okay. But it only takes one person to drop their defenses for a moment and do something stupid, for the whole other side to point fingers and claim that everybody else on our side is just like them.