A much older saying is "The only thing necessary for the triumph of evil is for good men to do nothing,"
So what you're saying Mark is that it is ok to ignore it because 'nobody will change his behaviour' and you are actively supporting 400SH even though the site allows it to happen and the owner is complicit. I repeat again if this was aimed at you would you ignore it? I doubt it.
What should be done is he should be reprimanded, isolated and made to look like the fool he is. He has already been banned from the 2 biggest FB groups for this reason (not even at my asking) and has had his posts regularly edited or deleted even on DAC (where the admin is hardly a fan of mine). If 400SH won't change its ways then it should be left to rot and certainly not promoted.
I understand that you want to 'just enjoy the hobby' but there are consequences to enabling this, which is what you are doing frankly.