Burning and destroying stuff in protests will never make sense to me.
And this is not just about France.
Look at the George Floyd protests in the US. Looting, destroying, burning. Such violent protests (or riots would be the better word) attract only those that want to:
a) earn quick bucks by stealing
b) let out their rage in a group setting where arresting them will be difficult
Hell, a decade ago we had protests in my own city. A bunch of idiots came with the peaceful protesters, started rioting, and before you knew it administrative buildings were on fire and IT equipment was being carried away by Johns and Janes Doe.
And guess who had to pay to get all of that fixed afterwards? Yes, the same citizens that destroyed it in the first place.