What an incredibly grossly written resignation-letter. Invoking god's providence is tacky and insane itself, but in the context of this administration it's basically blasphemous.
It's possible that this resignation is coincidental to him being confronted by citizens, and it's actually for some unrelated, possibly scandalous reason.
But, even so, the fact that it was mentioned in the letter is a good reminder that civil disobedience - in this case, in a very tame way - is actually very effective when it comes to enacting change.
A lot of the bubbles that we often talk about as a concept on the internet, are also very much a thing outside of it. There's no doubt that a lot of bad policy in the US is driven by genuine disinterest or dislike for disenfranchised people, but it's compounded by the fact that the ultra-privileged (who, sadly, by and large occupy important administrative roles like Pruitt had), are physically "bubbled away" from interacting with people who are on the negative receiving end of those decisions.
Thankfully, the ruling class still move in some places that are open for all/most, such as cafés, restaurants, theatres, etc, and haven't yet decided to live in areas that bar anyone else who isn't them from also living there.
So, these spaces where classes and different types of people can still intermingle (to some extent) are probably going to be increasingly important places for enacting meaningful, political change as individual citizens.