Precisely grasshopper. So are you saying trying to stab someone or chop off their head with a sword is Aikido?
To say that "trying to stab someone" is or is not aikido is not really relevant to dojo practice. In the dojo, someone is assigned the role of attacker and should fill that role with the same sort of connection, body movement, etc. that one uses when defending, ie according to aikido principles.
Outside the dojo, the correct question is not "is X aikido," but "is X morally correct?" Once you identify the morally correct action, then yes, absolutely, you should bring aikido (or whatever other skills you have) to bear in order to accomplish it.