As a coda to this - 'ill-judged' of course, means lacking careful consideration - which is what I think Morrissey has done in this regard. I agree with much of what you write - but really my point is that I am not going to throw Morrissey out because I don't agree with everything he says. That's it, really. And 'For Britain' (as that party is called, and horrifyingly run by an Irish woman) is a terrible political party. I am not debating that. My issue is that everything else gets lost. And as I mentioned earlier, I love Morrissey. It's complicated. And it's my prerogative. And there is no grey area in that, either. Or that Thumped is greatBritain First is a dangerous group which supports, be it implicitly or explicitly, violence against people, predominantly people being identified as Islamic. The corollary of this is violence against anyone who doesn't look "British". They are whispering in the ears of people who beat up black and Asian people in Britain. That's all you need to know about them.
By openly supporting them and encouraging people to join him in his support, which Morrissey is doing, can't be labelled as ill-judged. It's profoundly stupid and dangerous. Morrissey knows he has a large audience and he knows what he says is taken seriously by people.
He doesn't have to say he supports them. As far as I can tell he's only doing this to get people to talk about him. Trying to legitimise a far-right group to generate controversy and publicity is just disgraceful.
Edit: To add to this... Morrissey is making the headline "I support Britain First" and then demands people read more in to what he's saying, trying to imply this is a reasonable position. It's not and trying to draw people in to this kind of discussion, where far-right groups are being legitimised is a waste of time and energy. Sometimes things are simple: one of those is groups like Britain First are bad and there's no grey area or debates to be had.