No, Warhammer 40k does not need a 'ban' list because you can't control your emotions like an adult.
Recently, there has been much discussion in the Magic: the Gathering community regarding some Jeremy guy getting banned. For the most part, I don't particularly give a shit about this guy. Apparently he had some pretty volatile opinions, and said something rude about a cosplayer- which led to a bunch of people demanding he be banned from playing, his cards burned, his manhood removed, his mother beaten, and his online game account being banned. They got two out of five, which is pretty impressive for a bunch of whining card-players that haven't been inside a woman since a doctor yanked them out and sliced the umbilical cord.
I have rather 'unpopular' opinions regarding some cosplayers, primarily those that buy costumes from someone and then want your money to show half a tiddy- and even more, I loathe the pathetic losers who pay for this half a tiddy. So, you'll have to forgive me if I don't see this as a big deal. But, it would seem that this lady in question had just enough pathetic incel orbiters to raise a stink on her behalf, so this Jeremy guy got banned by a company that couldn't be bothered to make sure its tournament judges weren't rapists and kiddie-diddlers. Again, pardon me if I don't see one guy with a Youtube channel saying something rude about a chick in a costume to be such a massive problem, when you look at the bigger picture here.
Afterward, this prompted some members of the 40k Community to ask the question: Should Warhammer 40k have a 'ban list'? Granted, most of the people who'd ask this very question are the exact sort that probably should be ushered out themselves- you know, the perpetual outrage fetishists and a website that's basically the Buzzfeed of tabletop gaming. Well, they fucking would, wouldn't they?
Here's this novel fucking idea: How about we all get some intestinal fortitude and leave it to the local shop, club, or gaming group to decide who gets 'banned'? Look, I don't care about someone's 'outside drama'. Leave it at the door if you're gonna game, and if you can't do that then you need to fuck off. I don't care if someone upset your favorite cosplayer, or said something nasty to you on the internet- just don't bring it in to game. Unless someone is actually harassing you, then grow the fuck up and quit crying for a grown-up to come and protect your fragile feelings. Oh, and 'harassment' has a real meaning, and it's a bit more complex than 'this person upset me'.
Let me put it this way, in all honesty- do you think the average shop owner is going to give a shit about peoples' squabbles when he's hosting a tournament in his store? No, because he's a fucking shop owner and not the local arbiter of morality. He's going to ask you to leave your drama at the door, and boot you if you can't. It's pretty simple, almost as if we've been doing it this way for fucking years. Welcome to tabletop gaming, we've been handling our own shit long before you Perpetual Outrage Fetishists came in to 'save' us.
I'm no fan of actual harassment, and if it's ever revealed that this Jeremy guy actually harassed this girl? Then fuck him, he deserves to be booted out of the tournament circuit... but let's prioritize the actual rapists, pigs, and kid-fuckers that are holding positions of power in that tournament circuit and get them out first. And hell, as I understand there's actual evidence for the sexual predators, and not much for this Jeremy guy's 'harassment'. Imagine kicking a guy out of a nightclub because someone claims he had a pocket knife, but there's five drunk guys in the corner waving Glocks around and threatening patrons.
That's how I see this 'Jeremy Ban'.
The only 'sound' argument I've seen so far is that the Tournament Circuit and Wizards of the Coast have the right to reject him and refuse to do business with him for any reason they choose. Which, of course, the last time I mentioned 'refusing to do business with someone for anything you like', these same fucking POF's were screaming about gay wedding cakes. So it's nice to see we're still doing that 'it's okay when we do it' thing.
To get on point, what kind of 'ban' is GW going to have? I can tell you this right now, that company holds far less sway over the average FLGS than you think- and it's going to be really, really difficult for a 'list of meanies' to do anything when some guy spends hundreds of dollars in one trip and drops another $20.00 down to play in a tournament. So, what- now these 'meanies' won't be allowed in Warhammer World or GW stores? Oh, the fucking horror! Now where will they go to get overpriced mediocre hamburgers or get dry-humped by sales staff?
I don't know if you've been to a GW store lately, but if you spend enough money- they could care less if you're Interpol's most wanted international terrorist. I doubt some 'list' of 'extreme thinkers' is going to deter them from sacking up hundreds of dollars worth of plastic models.