Its true that most ICOs are scams. Myself, i have been a victim several times. But there are still some few which looks promising and must be suppported. The market is so down so even projects without the intention to scam end failing.
What you say is true. It's a scam project that has a lot of impact on good projects. But if investors check the project thoroughly before investing, I believe you will reduce the rate of fraud more. Currently, there are quite a few good projects to learn and invest.