Traitorfish
The Tighnahulish Kid
It's a conspiracy theory to say that the European Union is "a political organisation that seeks to destroy nations" and that, in supporting it, the SNP are "actively deceiving people".It's not a conspiracy theory to say a political party will convince people to vote against their interests. We see people round here apply that notion to the conservative party, the republicans, ukip and the aftermath of brexit about the working class who voted for it.
So no it's not a conspiracy theory to say people will be convinced to vote against their interests, it's just not usually applied to political parties you like.
Or if it's not a conspiracy theory, it's hysterical doomsaying.
Take your pick, I guess.