Something doesn't have to be a Political Party to be a group or have a group identity, even if its a loose one.
That said, to the topic...
Absolutely not. The Media does what the media does. If individuals that are part of the Tea Party don't realize this by now then they're either ignorant or fooling themselves. There's no reason to expect or suggest someone owes them an apology because it shouldn't matter either way to them, if for no other reason than it'd be hollow.
A large amount of the media and many on the left have long disliked the Tea Party and various conservatives. In the wake of this tragedy, rather than actually deal with the tragedy, they have sullied it by using it as a lifeless political tool to bash their enemies with regardless of the relevance, seeking to play on the emotions of average people. If people are shocked by this it is sadly only because we've deluded ourselves to thinking that possibly some people have a bit more decency than that. It seems that's not the case.
It is what it is, and expecting an "apology" or suggesting its owed is ridiculous. The only thing to do is combat the disgusting behavior with actual facts, logic, and common sense and go from there.