
The kissing was a dream, friend.
And I don’t think he necessarily wants to punish him for being attacked. It’s not specifically said but it can be seen as a type of possessiveness. There was the smell of another alpha on his soulmate. So he kinda wanted to overpower that smell with his own. It could even be seen as a type of „cleansing“ of the attackers touch. Which is a very romanticised interpretation but it absolutely fits the genre.
If the seme wanted to punish the omega for being attacked he’d call him a cheater and disgusting/dirty and leave him or humiliate him during sex. Which he doesn’t do here.
So i guess it’s not the best communication but it’s not punishment or victim blaming.

he didn't kiss the other omega, the uke just imagined that's what he came for late at night. umm, i think that's just his alpha instinct like sometimes it takes control & he's surprised at how he's sometimes losses control (like when he almost bit him, like if you think about it that side is not really who he is as a person. Everyone knows him as an alpha that never pays much attention & is serious). It's not necessarily about being mad towards the uke, but the act itself that another alpha was near their partner
So... I'm mad at both the uke and the seme. The seme takes in the uke, promises to take care of him and protect him but gets angry when another man attacks him.... I mean dude.... You brought him in an alpha household and left him alone... What did you expect? And let's not talk about you kissing another person right next to your partner's bedroom door. Like, lol. The irony is killing me. Please do better.
And now for the uke. Sir, you see your man kissing another dude.... And you're not saying anything... Why? He gets angry at you for getting attacked LIKE IT'S YOUR FAULT EVEN THOUGH HE IS THE ONE WHO'S SUPPOSED TO PROTECT YOU... and you're still not saying anything. This pairing is a bit of a big mess tbh... I'm waiting for the character development because I can't....