... If you argue against something being a crime then you end up supporting those who commit that as a crime. If you justify something as being reasonable, then if someone agrees then ypue have helped them to think that.
Yes, but it doesn't follow that you are also guilty of the crime - unless you actively induced them into it. I don't think, say, taking drugs should be a crime but that provides zero help for anyone caught taking drugs. Huxley, Leary, Burroughs, thought and wrote that taking some drugs was fine, but they are not complicit in any drug crimes thousands that read them may have been involved in. Individuals are responsible for the actions they take - not those of others.
Or take the recent case of the medical student that stabbed her boyfriend - many think either her crime was mitigated or at least she should not suffer the normal penalty for it - it does not mean they are supporting her in stabbing any more boyfriends.
As to the whole thing with Outrider, you thought just calling an argument something like 'barbarian social mores' was bad, but then you used the argument in precisely the way you objected to, but wasn't used by Outrider, by calling it bollocks.
Outrider put forward "barbarian social mores" as an argument against segregation, which it is not - it is an expression of his opinion of segregation (- btw I have no problem with that opinion). Similarly "bollocks" was my opinion of your assertion that ".. are complicit in it" - not intended to be an argument against it.