I think(hope) you just chose bad examples there(aside from that community leader one). I feel that the right reaction is to get as much information on what actually happened and act accordingly. If there is actual evidence that such allegations are true, and it sufficiently outweighs the evidence against, then the outrage is well deserved. However, what happens far too often is that people read an article from buzzfeed, gawker, or some shady source and feel that they have gathered all of the necessary information, when in fact the way such an article will portray a situation is not anywhere close to an accurate description of what happened.

I generally am suspicious of any article saying that someone did something super illegal/inappropriate/outrageous if it doesn't provide any real evidence for the allegations. 90% of the time the truth is far less interesting...