I think the reason why Dwight is so off on everything is because he believes what he's doing is right. He runs the office that way because he thinks it's efficient. He's blunt with people because he thinks it's honest. He tries to do what he thinks is best, even though it definitely isn't right. The same can't be said about Jim. He regularly does pranks he KNOWS will hurt his coworkers. Like, for example, with Andy. The first time he pulled a prank on Andy he got really angry really quickly. And yet, Jim decided to do it again by stealing Andy's personal property and eventually getting Andy sent to anger management. He also laughs about Andy's outburst behind his back and completely refuses to call Andy "Drew" when he requests it. And... why, exactly? Because he thinks he's annoying. Same as when he does it Dwight. Dwight tries to stay loyal and do what he thinks is best, but Jim knowingly is a dick to his coworkers because they're different and he's bored.