The County fan was the aggressor and was fined after admitting the charge of using threatening, abusive or insulting words or behaviour, with intent to cause fear of unlawful violence.

https://www.nytimes.com/athletic/6483597/2025/07/09/james-mcclean-wrexham-abuse-fine/

That's the only incident you've cited as a reason not believe McClean's claim of self-defence in the Cardiff issue. You don't have to like McClean but you've no reason to disbelieve his account.