We still don't know the motive behind this. If it's just a random act of terrorism by a religiously motivated (or other form) extremist, then it likely could have been ANY MP who ended up as the victim. The aim would have been for headlines, notoriety, to spread chaos and fear.
If, on the other hand, it's someone with a personal grudge, someone with a simmering hatred of all things Tory who has finally boiled over; a person who feels democracy has failed and has had enough of open corruption that our political leaders - especially those in government - don't even bother to hide anymore, well then, the discourse becomes much less straightforward.
There's
no justification for murder, but the motive needs to be understood first and foremost. Whatever happens, the depressing reality will be that both sides ultimately try to make political capital out of this in some form, most likely in security clamp downs.