In my view, people trust most of the other Crypto currencies and also Bitcoin. But it is not about trust, i mean in this time most of the other crypto currencies are trustable, but people prefer to bitcoin on others. Because bitcoin is a too much popular than others, and the same reason i have it so i am using the bitcoin.
I think people don't really trust cryptocurrency. They are in for a quick profit. They gamble with crypto instead to trust it. If they trust it then the question is, why do they convert it to fiat? They convert it to fiat because they already have profit and it is hard to buy with bitcoin in a store next door.