Albeit, if "society tells them this [the castration] is permissible" is the accelerator, than mandating that the individual,not society, should himself pay for the procedure should be the brake.If wanted bad enough, whether castration, plastic surgery, an ocean cruise around the world, or new roof, a person will find the money for it.
"Society" pays for things like curbs, street lights, waste treatment plants,etc. b/c society (a conglomerate of men and women) benefit from such expenditure. Taxpayers footing the bill for self/self directed-mutilation (castration, body piercing, etc.) benefits no one ...not even, apparently, the recipient.
Exactamundo! Of course this is British society that is even more liberal with the expenditure of taxpayers' money on stupidity like this than ours is.