I don't disagree with ESF, but I'll put a slightly different spin on it.
The lawyers who excel are often (not always, but often) the ones who are most aggressive. They are fearless about asserting themselves, certain of their judgments and conclusions, and unwilling to be easily backed into a corner. All of these things are valuable skills for litigation, and even for the types of negotiations and consultations that are the bread and butter of most attorneys' practices.
These same characteristics carry over into other aspects of these attorneys' lives, including their interactions with colleagues, even when they aren't meant to. So your employer has a choice -- hire the aggressive attorney who will fight for the company the way they want their in house counsel to do and accept a little collateral damage along the way, or hire the kinder, gentler attorney who will make everyone around them feel happy, but may not be the scary attack dog that the company wants to be able to turn to when the crap hits the fan. (It plays out this way in private practice, too -- many of the horrible managers are kept around and retain their positions of power and authority in firms because they are really successful at the portions of their job that people pay for, and you don't tend to tell the highest billing attorney in your firm that they're a crap manager and need to stop yelling at their secretary or you'll get rid of them.)