Isn't that just the same thing as covering our ears and saying, "Na na nana na, I can't hear you!"
If some causal effects might be travelling back in time, we should investigate it instead of just saying, "I don't like it, so let's just define it the way we want."
No it is not the same thing. It provides a different way of looking at the same problem. Because if we force the direction of time to be always forward, we would have to modify our understanding of physics to make that assumption hold, leading to a different view of the same results, which could be extremely useful.
If some causal effects might be travelling back in time, we should investigate it instead of just saying, "I don't like it, so let's just define it the way we want."