...unless you're optimising for other things, like keeping leaders accountable to laws. If you believed a given leader had broken laws which would theoretically

...unless you're optimising for other things, like keeping leaders accountable to laws. If you believed a given leader had broken laws which would theoretically result in their imprisonment under the current system, and you believed that pursuing their imprisonment would definitely cause them to seek illegal extensions of their power, you still couldn't come to a "should" statement about whether or not to pursue legal action without weighing the competing goals of "enforcing the rule of law" and "preventing further abuse of power" against each other and deciding which one you care about more (perhaps with some assumed probabilities of various outcomes attached) -- and that's if you accept that the ends justify the means, meanwhile the means-over-ends crowd will want to pursue justice even in the face of armageddon.