I'm glad Linus isn't budging on this one. As soon as you start considering how not to hurt someone's feelings, you're putting speed bumps in the paths of your thoughts. If something is fucking stupid, then someone needs to say exactly that, not "That's a good idea, but it seems to me and my mealy mouth that such and such may be another way of doing it...?"
The fact that the hacker community is full of mean gits is no coincidence. Let's consider where the opposite type of people (the ones who'll smile charmingly while stabbing you in the back) congregate - HR, PR, management, politics - all fields where creativity is less important than manipulativeness.
I'll take a brutally honest genius over a charming "socially intelligent" liar any day.