I thought the same thing about tech, until a very short while ago. I'll agree that there is a fair bit of hubris in the industry among developers ("shit code" vs "my code"), but beyond that, the arrogance that seems prevalent isn't really much more prevalent than general society.
It's just that the bar for entry into tech is, really, somewhat high in terms of social capital and intelligence, leading to a group of (generally) well spoken or well written individuals who often reality test their assumptions amongst each other. You'll see similarly well composed (not necessarily STRONG arguments, but well composed) thoughts coming out of similar fields: law, medicine, politics.