As to "beneficial effects", keep in mind that the trace amounts of something healthy would pale in comparison to the negative effects of the alcohol, which is much less of a trace chemical.
Plus, other lifestyle choices could give a false positive[4]. Stuff like eating properly and exercising might not be properly controlled for, giving an unrealistically rosy picture.
[1]https://publications.iarc.fr/62
[2]https://www.cdc.gov/cancer/alcohol/index.htm
[3]https://en.wikipedia.org/wiki/Alcohol_and_cancer
[4]https://www.health.harvard.edu/blog/is-red-wine-good-actuall...
[5]https://www.who.int/substance_abuse/publications/global_stat...
(The first page has a downloadable PDF. Didn't link directly because it auto-downloads, at least for me.)
EDIT: link formatting, removal of extraneous "keep in mind".