Which is to say they understand the situation perfectly and are acting with a firm intellectual grasp of what is going on.

The issue isn't that they don't understand encryption, it is that they reject citizens having any sort of power to resist the state. Which is cool and all, authoritarianism is always with us to some extent. But at its core they see this from the viewpoint that the state is fundamentally in control and sometimes it grants people the privilege of privacy because it doesn't think what they are saying is important and therefore they can be humoured. They'll pretend technical ignorance if it gets the liberals off their backs, but the only people they are fooling are the credulous.

But by doing that, they make it easier for adversaries to spy on their own citizen, which is a national security issue.

That's why it sounds like ignorance to me: I understand that they really want a backdoor just for themselves "because they are the good guys" and "for national security", but they don't understand that if they have a backdoor, then their adversaries will eventually have it, too.

The people in government have a hierarchy of threats. Social challenges from within their own nation always higher than those from foreign countries. Most politicians are perfectly happy to sacrifice national security to be able to see what their citizens are saying, they just won't articulate it in plain language because it sounds bad.

We can tell this because they're signing off on narratives around being "the good guys". Anyone pushing that sort of narrative spin isn't a good guy. That isn't how law enforcement works in practice and anyone in high political power knows it if they have even a shred of intellectual honesty; they've seen how the sausage is made and are well aware that the real world is all various shades of what happens when a family breaks down and siblings start fighting with each other.