All altcoins can't be a scam. It's too much of an over-reaching statement to say that they're all a scam. That's like saying that all fast food joints have E.Coli or something.
Some altcoins are headed by respectful people, while others are even headed by governments.
Anything can be a scam, yes... but not all altcoins are scams.
Eth is definitely not a scam because of its integration into so many things.
I agree of you that not all Alts are scam. We dont need to generalize all Alt or even cryptocurrency. It is like all of us who invest in Alt are scammers. Maybe there are some but we dont need to judge or make basis this opinions of others . Mind our own business and make it grow and profitable.