Well lets flip the omelete. How would you feel as an ATCO if a pilot on short finals asked another traffic not to line up on the runway as it judged the separation to be compromised. I can conceive a situation where it could be justified and it may prevent an incident or worse but.... it would be an extremely rear event and only justified in extremis.
If I am about to hit something by all means scream (anything!) at me but regarding the profile other factors that ATCOS cannot tell come into play (weight, wind, temperature, anti-ice...).