For many people it's a way to stop being couch political activists and start actually implementing what they believe in. That's why so many people are angry about Bitcoin - they truly dislike what it represents and allows.
Oh please. This is just like someone's mom telling their kid "they're bullying you because they're jealous".
The arguments against cryptocurrencies are legion. Some of those are arguments are very good. Some not so much.
But this argument of yours is nothing more than a baseless ad hominem attack leveled at people you disagree with.