The problem of the lack of trust in ICO is due to the many frauds committed by irresponsible people in searching for the Investors who have good intentions.
Closing the existence of ICO is not a good solution in the world of cryptocurrency, it is feared just cause a new mode. If these irresponsible persons are allowed to move freely, it will only give them time to look for new ICO-like scams. 
My advice should be tightened rules for people who are going to hold ICO projects, to cover the room for the perpetrators of this fraud.
I am convinced that closing their space with new rules will generate new confidence for well-meaning investors.