Funny to see you (even temporarily) modded down. When we were kids, the constant refrain was "if all you friends jumped off a cliff [bridge], would you". Now if you don't jump off too you're usually a "denier" or conspiracy theorist
No, that's still the refrain. You shouldn't do things because your dumb friends do them. The context here is completely different: if you were in a public space and everybody in front of your suddenly turned around and starting running your way, clearly afraid, you probably would too.
I probably would. Splitting hairs though, if I was watching a stock plummet and had no idea what was driving it, I think that would be analogous to your running situation and I'd try and dump it asap. If I saw a stock declining in reaction to news that I didn't think was so bad, I might hold or buy more, and if I was really certain, I might double down even as I was ridiculed for my choice - a la Steven Bury (sp?) in The Big Short
That's perfectly sound reasoning! But it's not the reasoning the OP offered: in their case it was sufficient to be bullish because everyone else is bearish, without regard for any actual interpretation of the news.