Well, no he has a point, it is bringing the Order back to it's originaly values.
Much better as the widespread "Sicario" logic of some.
A further point - which a lot of alfar lovers here fail to consider - is that the templars are probably the best safeguared for neverwhere and the alfar.
Medb says herself that they could never compete with all of humankind simply because of the numbers.
IF the templars fall and neverwhere becomes public knowledge, neverwhere would get swarmed by humans sooner or later. We would invade, colonize and breed like humans do.
At some point even the alfar territory could become affected.
Overall i feel like a lot of people here look at this conflict with way too much emotions involved (similar to the mc), at least if they want the mc to become someone making a difference and not staying a kid throwing tantrums.
I would argue even if you think the templars are the pure evil, its not smart to cut ties with them, it just restricts the mcs influence, knowledge and information as long as there is no hard choice to make.