Listen to yourself. There were people burning buildings, looting shops, destroying cars, and attacking innocent bystanders. SYL didn't say "this is wrong" or "this must stop". He said "the rioters concerns are legtimate". What do you think that is going to suggest to the rioters? That they wrap it up there and switch to more peaceful means?
He explained the riots within the context.
Not once did he say violence was justified.
In comparison, Nick Lowles, leader of a far-left organisation, claimed falsely that Muslims had been attacked with acid to inflame tensions.
I would encourage anyone to watch the Oxford union address. That you haven't seen it means that you are uninformed.
I would recommend anyone else watch it:
https://youtube.com/watch?v=_YQ94jFg_4A