Starting to hate Chesthair, honestly I wouldn't mind if he dies at this point.
To be fair. He's a police officer who has sworn to uphold the law. Oliver is a vigilante who kills people. Vigilantes are criminals themselves.
From his perspective:
Oliver's group just set a guy on fire. He doesn't know Thea is a little pit-crazy, even so, that's a no-no in his mind. I mean come on.
Roy pretended to be Oliver and got killed for it. He obviously doesn't know Roy faked his death. He probably thinks Roy is dead.
Sara, his daughter, died and Oliver & co went on months pretending she was still alive. This is more Laurel's fault. But he likely holds a grudge against Arrow, since Sara was mixed up with them.
And so on.
Yes, he has been a bit over-board with the negative. But his character only sees one side of this.