Why do you assume I trust myself? Personally I trust (know) myself to fall if I have unfiltered devices around. I don’t care much if others are OK or if they are secretly falling too, I know what works (or rather what doesn’t) work for me so I’m careful. I’m not even thinking in terms of yiddishkit, just in managing as a human. So I conclude to you and your question “why do people think they can trust themselves?” I don’t, and it seems from your question that you don’t trust yourself, so without basing my truth with others actions and what everyone else does, let yourself do what you know is best for you, and don’t care what others do! Hatzlacha Raba!