Blimey, I've just read his Wikipedia page:
https://en.wikipedia.org/wiki/Joshua_Bonehill-Paine
Born 1992, so although he was about 23 years old when he was jailed in 2015, it doesn't seem to have been a brief, youthful lapse of judgement.
According the WP page he was expelled from his public school for his behaviour, and was put in care at the age of 13.
He seems to be a life-long loose cannon and extremist, and a career attention-seeker. He's been running blogs and a YouTube channel, so presumably monetised to make a living from his prolific rage-baiting lies.
He may have decided to move on from targetting Jewish people (for now), but I'd be surprised if he's moved on from his behaviour.
The "oh I just want to give back to my community, and to thank them for being kind to me" just sounds manipulative.
I could be wrong. But he sounds like an absolute liability.