What pubs are we talking about townie? On my last trip I visited maybe half a dozen - Three Horse Shoes Sheldon, The Anchor, White Swan, Kerryman, Spotted Dog, Adam & Eve. Unless I'm going blind all I saw were groups of people having a drink, a chat, a laugh, game of darts perhaps. I'm sure there are dens of iniquity (The Crown in Station Street was one in my day) but I didn't get to see any.
You want to see druggies, scumbags etc. try Dublin. Now they have a problem.