So the question is how people still believe in all that stuff?

Easy money is very hard to catch. Especially while there are coins like Cryptonprivacy coin, which gained 50% right after the new listing and gained 50% more in the next 2 days.. People still look for some scams on their own. OMG, will it ever end?
People are inspired by other's success so especially newbies are really willing to invest in new meme coins and trends. They hope that they will also find a new dogecoin so they buy snubbing research. Maybe, it will end, when people become more careful and will investigate projects before investing. There is plenty of information about every project on the Internet but it is still require a lot of time to explore.