Drinking is a typical response to a celebration and always has been. If there is a reason to drink, then people will find it because they find it to be pleasurable. It is considered normal to drink on most occasions for fun or just to relax.
The problem is that a lot of people end up drinking to combat sadness. That is called self-medication and can be a dangerous road to travel down. Trying to fight depression with alcohol can lead to more depression.