The obvious reality is that Eich realized he fucked up and could no longer effectively lead Mozilla, given that they are as much about their self reinforced myth of being the internet good guys as they are about tech.

And so he stepped down.

The kind of scene that you are envisioning occurs in Maffia movies but not IRL. Eich was under a lot of pressure, but most of that as a direct consequence of the inherent conflict between Mozilla's stated external position and Eich's personal actions. When you are CEO of such a large company you know that you can't combine the two unless you mean it.

Props to Eich for doing what was right instead of further harming Mozilla.