But it's not if an effect is present: we do in fact know that alcohol consumption causes cancer. The link is well-established. What is surprising is that most people aren't aware that this link exists. IIRC the number of Americans aware of the link is something like 30%. According to this (https://www.theguardian.com/society/2018/jan/08/only-one-10-...) only 1 in 10 Britons is aware. (I assume even fewer people are aware that processed meat causes cancer.)
I understand what you're saying, of course, given that there might be some benefits that outweigh the risks when you calculate overall mortality. However, speaking personally, I think I would rather die of heart disease than cancer. In fact, compared to death by cancer, a heart attack sounds like a blessing (of course I'm aware there are other, slower and also nasty ways to go that are related to heart disease — but still). The main issue being, of course, that at least a slow death gives you some time to say goodbye and arrange your affairs. Still: I'd rather go quick and clean.
It's a morbid subject, but after recently reading The Emperor Of All Maladies, a masterful "biography" of cancer, this has been on my mind quite a bit. I love to drink, but I'm wondering if it's worth it.