True indeed. However, the thing he could have done is not to rush things and use clever plans and strategy, not jump into the middle of the enemies with no other plans than a couple of powerful jutsu that might or might not work for a while. If his plan is to punish Konoha, he really doesn't need to fight against all the bosses of all the hidden villages - and all at once to boot.
And just for the record, I'm not trying to say he's wise at all acting ruthlessly like this. I simply say it could be understandable from his point of view. Being suicidal is understandable as well because it certainly doesn't seem like he plans to happily live ever after.
But then again, it could be he's simply so blinded by his idea of a cold avenger that he hit through Karin for no reason.