Like us, deer live in matriarchal society.(Yes dear,your right,im sorry,Im wrong,yes dear,etc)But unlike deer we aren't violent to the boss when emotional,scared,angry,etc.
The lead doe/hind makes all the safety,flight ,escape decisions for the group.
Stags/bucks once mature are outside of the family unit & only concerned by a couple of things.The groups safety is not his concern,its hers.
If the stag/buck is enclosed with a group & not happy & wants out of there,it's her job to find the way.
He will push her until she does, or is dead,then he will start on no2 then no3 & so on.
The smaller the enclosure the more often & greater the risk.A quiet relaxed buck/stag which is not pacing the fence if threatened,with somewhere to run should not do this.
If he continues to do this in a larger enclosure with cover & this is not the cause,should you breed him?
Temperament is heritable in deer.
I doubt this is because she will not "stand" for the buck,when ready she should stand for him.Unless she can see something wrong with him.
Cheers Sharkey