Normally I'd think "the President should follow the rules as well, so they have incentive to improve them". But maybe with tricky issues like this, the apparent self-interest in changing the rules would be seen just as badly as breaking them.

Also: if you could just as easily break vs. change a rule, want to do so, but still believe it's generally a good rule - is it better to just break it?

I guess this is what both sustains and dooms autocracies.