The problem with Jedi is that they ultimately had never intended to become peacekeepers and mediators, but were instead dedicated to their studies of the Force: essentially a monastic order that later moved into more practical drives by virtue of need on behalf of the Galaxy as a whole, and (obviously), as a counter-response to the existence of the Sith, who sought to use their powers to obtain power, rather than merely to gain insight and understanding. Do bear in mind: the notion of peaceful existence and harmony with the Force is a little at odds with the violent, bloody, politically-driven nature of a chaotic Galaxy.
We all have the understanding (and it's flawed, I might add) that Jedi maintain non-attachment (this being separate from Detachment: well done to George Lucas screwing that one up!), suppress emotions (which they realistically don't), aim for peaceful conflict resolution (which Jedi on the board most definitely don't!) and seek to provide guidance, advice and aid to those who need it. Jedi seek understanding of the Force by seeking serenity within their own minds, surrendering themselves to the Force by pushing aside ego and attachment, becoming vessels for the Will of the Force. Sadly, that's a very difficult thing to achieve with blood and chaos around you.
Be honest: isn't the politically-heavy, incredibly violent and chaotic Galaxy that the Jedi work in likely to push emotional boundaries? Subjected to horror, violence, atrocity and vice, all sentient beings would find it hard to maintain their self-control effectively. Jedi would find it difficult to maintain that benevolent neutrality: ultimately you find Jedi like Mace Windu being lauded as the ideal. Jedi with that classical emotional restraint (this idea of being the calm in the centre of the storm) combined with strength in the Force and ridiculous capabilities with a lightsaber. The real truth, though? That's not being a Jedi: that's being a Jedi forced into war and violence, when reflection and contemplation should be the key to their psyche. Moreover, the idea of Jedi being peacekeepers (providing aid to those unable to stand up to violence) is not a Jedi principle: it's a role they've been forced into by society, because they have the powers of a battlecruiser without the sheer destructive force, and the judgement to restrain themselves. They're an excellent peacekeeping force, but that's not what Jedi do: it requires them to interfere and, ultimately, to use force when diplomacy fails. This is not their way.
Why do writers here not act like Jedi? Because most writers don't act like Jedi in peacetime: they started writing Jedi as depicted in war and conflict. Most of Star Wars only shows Jedi at these times - is it surprising that the Jedi Order is now a forceful arm for the conquesting Republic? Nope. Because the majority of Jedi you've seen (both Skywalkers, Kenobi, Windu, Yoda etc) have all been observed during wartime. Their peacetime role, the contemplative, aid-providing, guidance-offering Jedi aren't much seen, and always depicted as likely to be the first to drop when the firefight starts. Hard to see proper Jedi: they don't exist here.