There are two aspects to your perception of a political leader.
- Criminal negligence
- Civil negligence
For #1, a court has to prove him so, otherwise he is innocent.
For #2, if you feel that leader X is not upto the mark, then DO NOT vote for him during the next election cycle.
If there are enough voters who feel just like you, then the leader X will not come back to power.
And the whole thing will done without creating instability, gali-galoch, and other matami methods.
That is what we all know as “civilized methods”.