Pretty sure Trump has blamed other Presidents for not controlling riots, just as he blamed other presidents for Americans dying for pandemics.
And i am pretty sure he will blame others when these now happen, just as he blamed the media when they report anything that is not favorable to him, or by he blamed the democrats for anything he needs to deflect.
I am pretty confident he is blaming WHO to subvert attention from his own inactions, and wouldn't be surprised if the announcement about the withdrawal of funding just as the riots started was not a coincidence. Or perhaps the timing with the 100k death in the states.
Most had realised what a disaster he has been but some are now again united with him over a common enemy, black people.