Yeah, I fear that the "Remain" side will use this murder to paint the entire right-wing as psychotic or something. This is reminiscent of how the Clintons and Democrats in the '90s used Timothy McVeigh to make it seem like all Republicans or far-right individuals/groups were "homegrown terrorists" just waiting to blow federal buildings up.
I hope they don't get away with it but I'm afraid they very well might.