Originally Posted by Jel

All you need to do is the tiniest research on anyone on that list for example, to see that each of them know their shit (no pun intended for CS). A lot of successful people are time-conscious, and don't feel the need to make sure they tip-toe around threads in case they sound arrogant to some random stranger. Just like all sections of people though, some are gentler, for want of a better word, in their approach.