Trust in legit cryptos has always been there. Look at Bitcoin itself, so many times it is called a bubble and it has always manged to survive and thrive.
However, new icos with quick get rich schemes, 10-20x etc, and promises to change the world with millions of transactions, in a short period of time are making crypto space a mess and leading it to a failure. If someone sees a clear flaw in their claims, those should be exposed to the community and investors.
You can call it fud or whatever. I believe it is about showing the investors and community the reality they are supposed to see. Have a look at this file and see for yourself, how a person scoring above 80 has a lower chance of winning a lottery than a person with a score around 60.
https://github.com/QuarkChain/crowdsale-whitelist/files/2086839/quarkchain.lottery.-.Copy.xlsx
If you can't even code a simple lottery, how can people expect you to build a blockchain with millions of transactions, shards etc. etc.
QuarkChain if not a complete scam, it is very close to a scam