Robert - would be happier if youir statement read "why is castration not an option
even if you keep them away from females they will ride each other and could potentially still be active and could be tainted "
Boar taints certainly exists, but is by no means certain. The commercial world has largely given up castration, and whilst we can argue about whether it casues any pain or distress, many smallholders do not wish to castrate.
I would quite happily support your view that it is an option, and one that should be considered, but one for each to decide, and lack of castration does not inevitably lead to taint.
If you're happy castrating, then fine, I'm not arguing the case against.