I don't think that the Templar order is actually that united. There is no telepatic conversation generally, no telephone, email etc. So there is word of mouth and letters. The news don't travel that fast and never travel without distortion. So what you here in one location might be something entirely different in another location. And even people being present at the same time can recall things differently.
In all the games, the focus was on the mages side most often then not. Rarely did we witness the toll this whole thing and setting takes on the templars themselves. There was a bit here and there, but mages were somehow easier to see as being repressed by the templars. But it was not actually the templars, but the system. Templars didn't have it that funny and bright either. They were tasked to watch over mages, protect them and protect from them. But being isolated with the mages from the society for that long, there must be a tie, a tie that you fear to build, for you must sever it in certain cases. It is an awkward situation, where fear is present all the time. You are told mages are to be feared, and yet they fear you. It really is just a mess. However I don't see templars randomly walking around, they are just as captives as the mages, captives of own duties.
Some of the templars overstepped their line. Some other templars tried to stop them.
Some mages became abominations. Some other mages tried to stop them.
They are both just people. Neither had it easy.
I think the letters you find scattered brilliantly show the side and feelings of the various templars. Some of them did it to make sure their own children are safe from threat of magic. Some did it to make things right. Some started to fear themselves and wanted to get rid of it. Some questioned their bosses, some died in the attempt. Some just enjoyed the power it brought and wanted more, for they didn't want to feel weak and defeated. Some just hated mages and would have done anything, some beleived the mages are the reason of the explosion in Haven and wanted revenge. So many people, so many reasons.