Bitcoin proponents have a lot in common with pyramid scheme pushers. 'It is a completely new kind of system', 'the powers-that-be are scared of this new technology because this will destroy their old system', 'this will change the world', 'you are just mad that you didn't get in on the ground floor. but don't worry you can still be involved as this will only to go up', 'the price is undervalued right now but once it starts going up there will be no stopping it', 'this isn't a pyramid scheme or a Ponzi scheme or a pump-and-dump, this is legal and everyone hating is a shill for the other side!'. I'm paraphrasing a bit but you get the idea.
You should look up some videos of people supporting known pyramid schemes like Vemma and see the similarities between what they say and Bitcoin enthusiasts.