How is this productive at all? Or are they going for vote winning moves?

tit-for-tat, isn't it

I dont remember Canada killing two former Indian politicians in one week.

I think it has to do with them not investigating a flight bombing by the separatist group which occurred in the past under Trudeau's father (they are a vote bank for his party).

Just the accusation is enough to turn up the harrumph! factor by 1000