All I'm seeing is a bunch of people who self-inserted and can't give hasegawa a second chance because they wouldn't. They want that schadenfreude, that subtle undertone that they want to see someone get rejected.
But the MC isn't a paste in. The what started simple gains complexity. You're reading as yourself not him as a character. He's soft hearted. He's developed a mechanism to deal with reality but that mechanism isn't the only part of him. Truthfully if he really hated her as some suggest, he would not have gone digging like that. It would end on the roof. Even if other people aren't decent it doesn't mean you yourself end being decent as well. Personality traits don't go away easily