It is indeed true, many ICOs are scammers now, but I don't think that there are a lot of cases when this is an issue. Good and proficient investor will distinguish scamming from trustworthy ICOs, while novice might not see anything suspicious about obvious scammers. Some sort of regulation might be helpful though, but again, how can you trust that?
If only it were that simple. Mass scamming of the last year have made people reluctant to invest even in promising and seemingly legit ICO's. As a result, they don't get enough financing and thus have to return the funds to their investors. Within a week I saw a couple of projects failing to raise the required amount. And it looks like a vicious circle of sorts. ICO's fail to reach their soft cap while investors are further discouraged from investing in them. It is the same as it was with altcoins. At first, there was a lot of hype and plenty of money lost in scamcoins, then truly original and worthy coins had difficulty making it through.