The thing is, they also managed to block an ambulance that was rushing someone to the hospital. That person later died, and now they're all on trial for manslaughter.
How in the world does this help stop climate change?
It doesn't really; I think these are expressions of frustration over the inaction and ridiculous politics of it all.
On an emotional level I find it hard to to be sympathetic to be honest. The solutions aren't even that hard, and the amount of investment needed isn't even that large (relatively speaking). It's very frustrating things go at a snail's pace just so $political_party_x can claim 0.2% extra GDP growth or whatever, which will of course be paid for many times over down the line in a country like the Netherlands, half of which is below sea level already.
Does this sort of activism help? No, almost certainly not. But it seems like everything else has been tried already, so... why not try it? For my part, I just accepted it's going to be fucked and not much we can do about it.
0: https://www.svt.se/nyheter/lokalt/stockholm/domen-mot-miljoa...
Do you have a link handy?
This is a bit like saying: how in the world will advertising make people buy stuff on a massive scale?