well, that is a discussion I better leave alone, maybe those whole politics grew over Lucas head when he wrote the script, maybe he just lost direction ...

What irritates me more is the apparent moral dilemma, caused by the Jedi (and maybe their Codex)

They should be protectors against oppression and be keepers of peace, one could argue only inside the Republic's borders, but the Force knows now boundaries!

Why is it, that they leave slaves imprisoned (for life), seperate families, forbid(?) love, even leave friends to die ... ?

That doesn't make sense to me, those are not the "noble" Jedi Knights I would love to see!