Partly fair, partly not. I coached traveling baseball for 4 years mainly because we had trouble finding other Dad's who had the time and knew anything about baseball. I friggin loved it. Still miss it and "my" teams ended up being damn good as a bonus.
But I certainly encountered more than my fair share of coaches you are talking about. 9 out of 10 seems harsh though. For the most part I think they end up being guys completely over their heads with the responsibility and really don't know anything about coaching. More clueless than conniving.