It's not that they don't care about traps its that the 14/2 drow wiz rogue has seach and disable in the mid 60s... the ranger mutt has search and disable in 50s etc etc...
So when there are 2-3 people already in party that can do all the traps with ease why would they want someone who could only do that? In short a rogue is a melee class that can do traps. If you forget the melee class part, that is just being a bad rogue.