This:
For instance, Warren Buffet criticizes Bitcoin telling that it'll become "worthless" over time. It's these negative comments, which make people skeptical about using Bitcoin and cryptocurrencies as serious money for day-to-day payments.
he is not "most people", he is just a person who has said what he thinks and it does not change the opinion of many people so much that today the bitcoin price is very high and has had a great adoption, so it shows that the opinion his is not affecting bitcoin, so I wonder:
Why the hell do we have to worry about Warren Buffet's opinion?