For every bitcoin maximalist there was already a scam shitcoin or ICO. And more schemes will rise.
Blaming only the maximalists means ignoring half of the reality.
I don't say altcoins are bad, but how many are actually good?
Depends on what you mean by "good"? A lot of altcoins coins that brought profit at the time of entering the market and then fell to zero, and there were also coins that were shitcoins and after a while did to the moon. So everything is relative and there is nothing specifically good or bad.