Because only people with a high enough conviction of benefits of moderate drinking are commenting here and arguing for. However I have no idea how they do become so strongly convinced in that, given the low quality of the data that exists, the general reproducibility crisis in bio-sciences, precedent of complete compromise of a large study, things like https://slatestarcodex.com/2014/12/12/beware-the-man-of-one-..., the argument that if moderate amounts of ethanol were beneficial we would have just evolved to synthesize it, etc.

I think the most likely outcome is boring: moderate amounts of alcohol are moderately harmful, but not harmful enough to be immensely obvious and not harmful enough to outweigh the non-biological benefits some people extract from it.