Yes, why bring a child to a protest?
There has been plenty of talk here about the unfortunate children who were peppersprayed, roughed up in the push backs, etc., etc. And while it's easy to say "the police started it" -- which is, in ways, no doubt true -- it was entirely predictable.
Children have no political opinions. They are dragged-along bystanders, dragged along to an event where the possibility of chaos was quite clear. So why bring them? Or, perhaps more accurately, why bring them into the vortex of the where chaos is all the more likely? Why not stand on the far edges of the crowd with your child, holding a sign and staying out of the way?
Yeah, "who's streets, our streets." Whatever. A parent's responsibility for the safety of their children is far more real and important than quibbles about who started what and where you can stand at any given hour.
As a side note, I saw no peppersprayed children first hand, and only a small number of children in the active protest zones.