Finally on a computer, this will be much easier.
Faust, the WIFOM comment wasn't directed specifically at you, I think it was Xeiron who brought it up.
From my point of view, there's 3 facets of the Nkirbit case that I've seen cited.
1) He's frustrated.
Yes, he's frustrated. That's pretty clear. But so what? Frustrated!=scummy. Frustrated=frustrated. As Xeiron pointed out, we've seen frustrated scum, and we've seen frustrated town (Ash vs. Mcmc is Mean Girls). To me, the frustration is very obviously genuine. Now, this doesn't mean he's town, but this doesn't mean that he's scum, either. I DO believe that it's more likely from town, and scum has much less incentive to act this way. There's a chance it's WIFOM from scum!Nkirbit, but I really doubt it.
2) He doesn't care about the game.
Even though he's said this, once again, it doesn't speak to his alignment. It could be town, or could be scum. I can't tell. I don't know how anyone else can. Once again, I get the same reaction from points #1 and points #2. Even if he does care less, it shouldn't matter -- we want to lynch scum, not lynch town who care less. And I think his being in this game has caused opinions, which is very useful.
3) He's pushing claiming.
From what I scanned, he claimed anti-vig, and then questioned something else, and has pushed Galz for info, right? I think nkirbit "pushing claiming" is an exaggeration, though. Regardless, even if he is, it's anti-town, not scummy.
Now, I get a mostly null read on Nkirbit from his behavior. If he hadn't gotten any votes, I would lean town, but it would be pretty close to null. However, he's now got 8 votes. To me, this gives me a huge town read on Nkirbit. The case on Nkirbit, boiled down, is that he's acting anti-town. Whatever, it has some merit. But, importantly, anti-town is not scummy!
Nkirbit's behavior, from a scum perspective, is an easy case to push. It's very, very easy to paint anti-town behavior in a scummy light, especially on D1. Scum can just wait back and pounce on someone who makes themselves an easy target, which I believe exactly what is currently happening. It's a bogus mislynch case that's easy to push, and the fact that so many people have jumped on it convinces me that there's scum on board.
I just haven't seen anything in Nkirbit's behavior that says "scum" rather than "anti-town". The points people have made aren't compelling, and seem to me like they're trying to get anti-town behavior painted as scummy. Nkirbit is an extremely easy mislynch, and that's what's happening now. Scum are on his wagon without a doubt, hoping this goes through.