imho alcoholism is treatable.
Yes, but the success rate even from the best private rehabs is less than 30% by their own stats. By sensible measures, i.e. 'treated' = 'cured' = no recurrence, ever, of uncontrolled drinking the success rate is very low indeed, single figures.
Futhermore, almost all treatments are based on the 12 Step programme originally invented by the founders of AA and hijacked (what a word to use on PPRune!) by the rehab hospitals. The treatment includes removal of triggers; the worst triggers for an alcoholic to slip happen many times a day for the typical airline pilot and are unavoidable in this job. Suppose you were a commercial beekeeper for a living and suddenly became hyper-sensitive to bee stings, that now cause anapylactic shock, (this is a real problem and does happen) would you still work the hives?