Gnu I'm glad then that the Times have said that.
About twenty years ago now, I worked with someone who went on to kill his ex partner.
Members of his family claimed that he was provoked because he went to collect something from the home he had shared with her and found her with another man, so she provoked him. They were very keen to establish that he was the real victim, even though she was the one who was dead. She'd had an affair, and brought another man into his home, and he was upset and didn't mean it but it was her fault.
I've never liked the provocation argument anyway but I don't think it should apply at all to "she broke up with me / met someone else, and so she made me kill her."
What his family didn't say, was that when he went to collect whatever it was, it was in the middle of the night, he broke in, and she was asleep in bed at the time.
She was asleep when she 'provoked' him, after he broke into her house in the early hours of the morning. Which he only did because he really, really needed to collect something at that very moment.
'Provocation' of that sort should never be a defence to murdering someone. This kind of 'provocation' is something we all have to face at some point in our lives.
Someone ends a relationship, romantic or otherwise, and even if it hurts, we have to get over it. Accept their decision and move on.
Johnson's mental health might have made that a lot harder for him to do, but if he's so mentally ill that he repeatedly kills his partners or ex partners because he feels provoked, he should never have been free to start new relationships, and we should be allowed to call him what he is.
He's admitted to murder this time according to the linked article. I think his past crimes should also be called murder as well.
Manslaughter is an insult to the women he has killed.
And yes, I also feel very sorry for the driver of the train.