Doesn’t that prove too much? You can apply the same logic to, for example, using transport (each time you try to ride a train and it doesn’t hurt you, your trust in “use transport is safe” increases, so you try to ride a motorcicle). Or to sport (each time you play ping-pong and it doesn’t hurt you, your trust in “sport is safe” increases, so you try BASE jumping).
Just… when you decide what to try you should not use a mental category that includes both LSD and heroin. I don’t think it’s that hard.
Anouther one; not that sure, but >50% and I think it’s in the spirit of the thread:
Non-negligible (on average >25%, <75%) fraction of badness of rape is a consequence of the fact that the society considers rape especially bad.