If bitcoin is a stupid invention then why do you join the bitcoin forum and care about it? Do you think you're smart when you join a bitcoin forum and say that bitcoin is a bad thing? From this alone I can judge how low your IQ is. As for whether bitcoin is good or bad, whether it is a great invention or terrible, there is a global community that evaluates it, and with your limited knowledge, you are not qualified to evaluate bitcoin. Many governments, countries, organizations and companies have recognized bitcoin, do you think you are smarter and wiser than those people? Knowledge is what you need right now.