One time, a fellow conducted a Twitter poll. He asked whom people would go for if they were given the chance to decide the winner between their less-talented friend and a stranger whose competence and expertise isn’t in doubt in a contest.
More than eighty percent of respondents indicated that they would vote for their friend. They would rather see their ally win. It was a matter of loyalty. They know their friend and would love to see them succeed despite their glaring shortcomings and the fact that the other person deserves it more.