When you're spending more time at work than at home, occasionally it's nice to have a beer at work. Don't get me wrong - I'd rather be at home, not working, drinking a beer but it's natural that drinking and work collide when you are working too much and are already stressed.

This is a really good point. A lot of things are going to collide if people are working too much and stressed.

The usual "best practice" advice on avoiding harassment is to not pursue romance at work... but how are folks supposed to do that if they don't have time to pursue it anywhere else? Alcohol might only be a minor contributing factor at that point.

You've obviously never worked in customer service...

I'm joking...well 1/2 joking anyway. (sigh)

Because it's fun, and it's a good way to lighten the mood.