The Jedi had no right to arrest Palpatine

the jedi had the right to arrest palpatine because his term of being supreme chancellor was expired so he shouldn't be supreme chancellor at that time, and he was a sith.

Yep.

Politics is shIte anyway.
Whoever is more powerfull wins, simple as that.
If the majority in say, the US, voted for someone who´s policy was to take over the world, with a 80 -20% landslide victory would it be correct? doesn´t the majority rule? even if the Majority is insane?.

Note:- I´m not trying to say all Yanks are insane, just using the US as an example.