Zimmerman may have made a mistake in continuing to follow. There are things that can follow that don't lead to him shooting Trayvon Martin though. Did Trayvon panic, thinking he was threatened, then just decide to attack Zimmerman? Just because Zimmerman may have made an initial error in judgement, it does not show malice, whatsoever (nor does it absolve him of it)
Calling an incompetent President an "incompetent" qualifies as calling him names? M'kay. Someone should send the memo to Bill Clinton.
I highly doubt any of our presidents have been incompetent. We may like the policies of some better than others, some may have had their terms blemished by world events, but it takes a great deal of competence to even get to that office.