The primary fraud idea is somewhat silly - if you end up stuck with a ballot on the other side, what’s the point really?
Well, you could vote for someone you though had no chance against your own party’s candidate in the general election.
This is not a smart strategy. I remember some Dems saying they were hoping the GOP would nominate Trump because beating him would be a cake walk. Look how that turned out…
Well, it doesn’t always work.