So because I invest in a stock I need to talk it up and defend it every time someone expresses an opinion?  

I will take decades of proven results combined with all of the realities of today and expectations for the future over pure speculation about what the short term trade holds for a particular stock.  None of that course means that bad things can't happen.  But it is better than relying at best a bunch of unsubstantiated nonsense and at worst doomsday conspiracy theories.

No need to fear an avalanche when your portfolio is protected by a shed that allows you to rest comfortably while others think they are smart enough to ride on top of the avalanche.  - We all know who ends up needing to be rescued.