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.