Perhaps because they are generally expected to have control over their desires, exercise mental discipline.
Catholic Priests have been expected to be celibate so clearly expectations over human behaviour don't mean much on long term and many people.
I mean if you break it down per capita, Catholic priests are far less likely to sexually abuse kids than school teachers are, so there's likely some sort of effect on behavior (and/or selection effects amongst those who choose to become priests and teachers).
That is why I said "on long term and many people". Buddhists also over a long time period and in aggregate compared to other religions do seem non violent.
The whole point of becoming a monk is to try to have control over their desires, exercise mental discipline like how Buddha does.
If one is already able to achieve all of that they won't even need to become a monk, because they've already achieved what they wanted to.
That doesn't mean being passive to everything.
But it does mean being passive to the sort of urges that might drive violence against a minority religion.
Nope, it doesn't, the idea that being a monk is just being happy and let everything pass is a wrong reading of Buddhism.