Yeah I'm normally a big proponent of responsible disclosure, but in this case, I think the more painful, damaging leak is required.
Firstly, autocrats, fascists & oligarchs don't care that much if you hack them. They will just keep using these tools (or another one just like it) ignoring the correct procedure their government already wants them to use. The citizens of affected nations need to be made angry by their leaders' failure to do their jobs correctly, and that's only gonna happen when there are consequences for their actions. Their incompetence put their nations at risk, and now it's clear they have failed to keep their intel safe. They have failed hard, let them fail hard.
Second, journalists and researchers have almost completely lost their power. In a non-democratic world (we're nearly there, just give them a little more time), when a journalist exposes corruption or incompetency, that journalist/researcher is simply silenced by the government. Silence the journalists and nobody knows what's going on so oppression can continue unchecked. Every person who gets silenced has a greater chilling effect on the whole society; nobody wants to be next. This is how authoritarians gain power. Oppression with no resistance or consequence legitimizes the oppression.
If we were just talking about typical corporate incompetence re: security, and the only thing at stake is a single stock or individuals' data, I would say disclose responsibly. But when it comes to stopping autocracy, the gloves have to come off. They sure as shit aren't gonna play by any rules, so neither should we.