Is violating causality via FTL really a problem? Can someone explain?

I'm trying to think about this, but right away my brain stalls out:

1. I observe an effect, necessarily arising from a cause.

2. I teleport instantaneously to a location in spacetime where the cause has not yet occurred.

3. ???

4. Violation of causality! Everything in the light cone ceases to exist! The universe begins to unravel!

But what actually happens? Or would happen, hypothetically? Theoretically?

via International Skeptics Forum https://ift.tt/eQmX1px