Because they're worried about the climate and inequality. And why are people doing the same thing in Brazil? They are sick of seeing several corrupt politicians pocketing giant kickbacks while asking them to make sacrifices and swallow more austerity measures. Like pushing back the retirement age and putting a ceiling on pension benefits.
Not very different from what happened in North Africa less than a decade ago. In Mauritius too trickle-down economics has broken the economy and inequality has reached levels never seen before. This is simply not sustainable.