management and genetics, if you don't tolerate bad and/or aggressive behaviours then you are less likely to see that.
Ever notice how hot headed owners have hot headed cattle? Coincidence? Disposition is highly heritable, in most species, the local newspaper will show you generations of bar brawlers
Selection for disposition is subjective depending on what your personal tolerance and situation is, in our herd we have zero tolerance for aggressive or excitable cattle, I have young children and many of my customers (and myself for that matter) are getting older, we might think we've still got wheels if the need arises but from experience I know I'm not as fast as I was or would like to think I am.
Whatever happens, be consistent with your criteria, too often the excuse cow (you know, ol' 86 who always raises the best calf but won't let you get within 200 yards of it or anyone else calf for 2 weeks) will put you somewhere where her combined receipts for her years of production wouldn't cover the bill.
Ranking breeds is again subjective based on personal experience so I have no intention of going down that road.