Just watched this, a few hours ago.

What I don’t get is that t4t strategy is reactionary, what if in the real world another nation/person/entity does something so drastic that you csnnot retaliate and annihilate you.

Pro active strategies might not win in game theory but it may as well ensure your survival in real life.

If I understand correctly, tit-for-tat is the best strategy so far. But it is only based on a competition and some simulation. I wonder if we will ever find and prove an optimal strategy.