As long as you're a left-wing activist, the cause doesn't really matter. Climate one day. Palestine the next. French high school students the day after that, in a movement with more than 6,000 arrests and schools set on fire. Tomorrow it'll be something else, and next week something new again.
The cause changes. As long as it fills the emptiness inside and the anger over that emptiness has somewhere to go, it doesn't matter what the sign says.