Why the heck do some alleged candidate supporters enter threads dedicated to other candidates

[saracat]

and bash the candidate about whom the thread was started? Do they seriously think going from thread to thread bashing a candidate enhances the credibility of their chosen one? Why can't some posters just build up their own candidates instead of tearing down other Democrats? I just don't "get it"I understand "debating" the pluses and minus and comparing candidates but the bashing of opponents has gotten ridiculous! One of these people will be our nominee and some want to do the GOP's job for them and provide talking points!