People who strongly believe in EMH are usually theorists. There are way too many people who's practical track record is way too good to be attributed to chance. I believe markets are random most of the time, but there are moments when they are not. That's where the best traders place their bets.
Also, here's my favorite counter argument to EMH - https://securityboulevard.com/2020/04/investors-buy-up-the-w...