Utilizing a caliber originally designed as an anti-aircraft weapon on deer is unethical and down right dangerous.
That is why we have shotgun only and ML hunts.
Good thing the sheer weight and price of that caliber only tempts a few nimrods but there must be a need for them to compensate for their smaller "manhood" part.
It is not being "anti" to voice your opinion when you witness stupidity.
The real "anti's" frequently form their opinion without comment. It is them we need to worry about and explain that acts like that are not the norm for hunters.
https://en.wikipedia.org/wiki/.50_BMG