Altcoins are clearly high risk high profit investment, yes if you won't do proper research - it is dangerous. But when you are sure about your alt, made good research, you can't name it dangerous at all. Cryptocurrencies are future and no one will stop it.
And just to make sure that you invest in a high profile holder of an altcoin before you out your money.
But many holders has a different thoughts, because of their experience. But I am sure that altcoin is our future.