That's a very strange way to assign responsibility. Rather than push it onto the alien leader who actively made the decision to pursue Saitama, you've pushed it onto Saitama, as though the alien leader's desire to fight Saitama is Saitama's responsibility. Assigning responsibility in this manner only really makes sense when there's some great, ultimate power who's desires cannot be manipulated by any other higher forces. You seem to be evaluating all of this then from the perspective that Saitama has already attained Godhood. I don't think it makes sense with a story like this. It's a shounen after all. There aren't meant to be any actual Gods here. Every character is only responsible for himself and your form of responsibility-assignment strips every other character other than the God-character of their agency. It instead creates characters where you have, essentially, a Dad and everyone else is this Dad's child who has to control and manage everything for them to protect them, keep them safe, tell them what to do and what to think, etc.
The very fundamental nature of imageboard culture, founded upon the nature of the imageboard itself is such that, I would've never expected to see an opinion like this here.