Bonus points for starting with the point that forget warp, subspace communication breaks causality already, so you don't even need to boldly go anywhere for any of it to be kinda busted.
If that's a bit too dry you can search for a similar subject line, there are TONS of explanations like this one out there.
Anyway, none of it makes sense, it's all for funsies anyway. Suspend disbelief, ye nerds, and enjoy your sci-fi.