If Bioware wanted, they could have easily removed an option to side with them.
But they didn't and thus, I'm hopeful about the way they were written.

They look better here but that shifty one is still around and I don't know about you fellas, but I wouldn't leave Bethany alone with him.
In Dragon Age Origins we could:
let a group of elves be sold into slavery/ sacrifice them in a blood magic ritual to power ourselves up
Let a kid get possessed to get more power
Kill an entire dalish clan with werewolves
Abandon Redcliff and let everyone there die
In Dragon Age 2 we could:
Let an insane serial killer live who would no doubt go free and kill some more
Allow somebody to get possessed for power
Sell Fenris back into slavery
Agree to kill mage supporters instead of simple apostates
Don't think that just because you can side with them that they are a good choice. After all, even the devs admitted that they went overboard with the evil mage stuff in DA2 so don't expect as much of that against the mages in DAI. Furthermore, it seems like siding with the mages is made the "good" choice in both games. Don't forget how Lambert is the ANTAGONIST in Asunder which seems to favor the mages. Hence, it seems like mages are considered to be the "good" choice.