Alright, I guess this plate of beans isn’t going to overthink itself.
First off, these are sailors who spend their time in a bar all the time when they are not at sea. That’s pretty weird. To understand any work of the literary imagination we must refer to previous works, and by doing so we immediately realize what kinds of sailors these are - that’s right: PIRATES!
Are there any other types of people who spend all their time in a bar? That’s right again: ALCOHOLICS!
So what these alcoholic pirates are trying to tell us is that alcoholism - as fine as it is - cannot compare to what one does at sea, which is piracy. Which is as it should be, alcoholism is a syndrome, a disease - but piracy is a calling.