I'm with Grumulkin here Matt.
By your logic the argument could easily be made that all guns should have a silencer on them to reduce noise. It is your fault for pulling the trigger, not theirs afterall (I don't agree with this - hearing protection when around a known gun going off IS their responsibility). I know you don't like brakes, but to say using one is rude and selfish isn't fair.
I must say I agree with Matt.
There is a huge difference in noise between gun with and without a muzzle break.
You need to be very unlucky to lose your hearing from being a bystander when some shoots from a gun without a muzzle break is fired.
You can very much lose it from just one shot from a gun with a muzzle break.
Some years ago I was the one responsible for the shooting at a public shooting range.
We found that shooting with muzzle breaks was so disturbing for other shooters, that we had to make the decision that people wanting to shoot with muzzle breaks had to shoot in their own groups.
And of course the muzzle break shooters complained.
The funny thing was that no one wanted to shoot beside another shooter with a muzzle break.
Not even the ones that had a muzzle break themselves.
So most of the time we had to leave one open shooting space between each muzzle break shooter.
When it comes to protecting the hearing.
That is totally possible when at the shooting range.
It is a totally different story when hunting.
And I really think it is totally selfish to go on a hunt with a guide/PH/tracker and expect them to use a hearing protection or they can blame themselves if their hearing gets lost.
A muzzle break can be accepted at a shooting range if some rules are made about them.
And it can be useful in war when some hard hitting cartridges are used.
But it has nothing to do on a hunting gun you plan to use with others close to you.
I would guess that most people use a 460 Weatherby on a DG where there will be other people close by, so if they see such a need for using that cartridge when hunting, they should do so without a muzzle break.
To buy a 460 Weatherby and download it is totally silly.
What is the point of buying one then?
It is like I should buy a 300 Weatherby and download it to .308 win standards because I think the recoil of the 300 Weatherby is to much.
And I have still not seen a good argument for why a hunter needs that cartridge other than they might think it is fun or macho to use one.
But I don't think it is very macho to use a muzzle break, so that leaves the fun argument alone
I can ever so slightly understand why a PH want to use one, even if I think there are plenty of other cartridges that can do the job as well, but I really hope they will use one without a muzzle break if they really think they need one to do their job.