Before I could trust an ICO, there must be a regulatory authority that governs the affairs of all ICO, which means every ICO must have registered and pass through the thoroughly screening from the authority, by then I'll trust ICO.
I think I can trust ICO because there are many people who invest in ICO and see the white paper and its implementation team because already many people who invest in ICO but do not get profit then from now on I can trust ICO because first see white paper and teamwork