Gurthang, what are you talking about? No-one's saying so-and-so can't be a wolf. We're trying to determine likely wolf behaviour! We have to place a certain degree of trust in some people. If someone has a good voting record and speaks a lot of sense, and is helpful in tracking wolves, then it speaks in their favour somewhat.
Of course they could still be a wolf, but we are meant to weigh up evidence. If a wolf is not likely to take a certain course of action then it is likely that someone taking said course is not a wolf.
Likely, not definitely. We can't suspect everyone equally.
Anyway, another thought. Someone pointed out (with good reason) that the wolves can afford to lose one of their number in order to take out the Seer. So if Glirdan is a wolf then it's entirely feasible for the wolf-team to kill Anguirel (who voted for Glirdan) and let Glirdan fend for himself.
So, Glirdan....you're a wolf.
Farael, Kath and Lalaith all make fair defensive points. I'm still watching them.