Ok, so, as I understand it, the counter to this is that it wasn't initially meant to be a 'debate' as a focus, it was the inaugural event for a support network for LGBTQ+ people. As is completely customary for this sort of thing involving barristers, a discussion about law was included as part of the proceedings.
Given the auspices and the line up including Kelley, it's entirely likely this was some of Stonewall influenced network, and the topic under discussion was the 'conversion therapy ban', which is Stonewall's current campaign.
From the looks of things, it was very much a soft-soap promotional of the idea to begin with, and it looks like some sensible people may have said "Um, this is not a neutral thing, and there are some legitimate opposing views, and we're a group of barristers, what the heck is going on?"
So, while I have some sympathy for those hoping it was going to simply be a support network, not a big debate about conversion therapy, the way to avoid that would have been to not have the topic of conversion therapy as your 'discussion'. Pick something else. Pick the appalling situation in Ghana, where even the Archbishop of Canterbury has said he won't criticise the homophobic bishops there supporting horrific legislation.
If you choose something that many LGB people have serious questions about, then yes, it demands a robust debate. As someone who actually faced conversion therapy, I'm quite, quite disgusted that these LGBTQ+ barristers wouldn't want that to happen.
I'd like to feel supported by a work network that is supposed to include lesbians, and instead I'm having to work with people who share articles saying lesbians are liars and keep asking if I think I'm a man or not. So guess what? Barristers are going to have to pull their big girl pants up and deal with the fact that Kelley & co are promoting a religion, and that should not be accepted uncritically, especially not by sodding barristers!!