We don’t need defense, and we don’t need offense, they are not mutually exclusive. The third choice is to ignore the idiot. The media keeps screaming but they scream about everything. I’d love to see him indict 100 more Russians and Putin. It just makes him more and more irrelevant.
In political warfare, defense is always the losing position. YOU might ignore them, but a good portion of mainstream America won't, and all they will hear is "Trump/Russia Collusion", as though it were true.
Ignoring the issue and refusing to fight is typical of the right, though.