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We're living in a democracy, not a dictatorship, if they want to choose this self-indulgent path where they get to LARP as heroes who are bravely fighting their imaginary fight by just being a complete pest to the rest of society then they're going to have to accept the consequences of their actions.
Yes, it is a democracy. Hence, people have the right to peacefully protest about issues that other people might dismiss as rubbish. Obviously, there are limits on peaceful protesting though.
Imaginary fight? Do you not accept that GHG emissions from extracting/burning fossil fuels are responsible for global warming then?
Sadly they don't seem to be prepared to admit that they're wilfully breaking the law for a righteous cause even, in fact, they tried to weasel out of it and attempt some sort of jury nullification thing and it backfired thus the sentences:
Well, when engaged in a campaign of civil disobedience the ultimate objective is to "live to fight another day" not allow oneself to be silently led away to prison.
After all, if you are in prison you cannot do anything to raise awareness for the cause. If you can convince a jury that you shouldn't be punished then that will result in more useful publicity for your campaign too.