I’d say that in most contexts in normal human life, (3) is the thing that makes this less of an issue for (1) and (2). If the thing I’m hearing about it real, I’ll probably keep hearing about it, and from more sources. If I come across 100 new crazy-seeming ideas and decide to indulge them 1% of the time, and so do many other people, that’s usually, probably enough to amplify the ones that (seem to) pan out. By the time I hear about the thing from 2, 5, or 20 sources, I will start to suspect it’s worth thinking about at a higher level.
I’d say that in most contexts in normal human life, (3) is the thing that makes this less of an issue for (1) and (2). If the thing I’m hearing about it real, I’ll probably keep hearing about it, and from more sources. If I come across 100 new crazy-seeming ideas and decide to indulge them 1% of the time, and so do many other people, that’s usually, probably enough to amplify the ones that (seem to) pan out. By the time I hear about the thing from 2, 5, or 20 sources, I will start to suspect it’s worth thinking about at a higher level.