Ah Smiddy, you're running wayyyyyyyyyyyyy ahead of the chariot - "They seem to think that all they will do is enjoy a carefree life with little or no concerns problems or worries."
The vast majority/all of JW's are totally oblivious to their "faithful slave's" twisted teaching of John 5:28,29 which claims that these sins - the vile things - will be practiced after the resurrection, i.e. during the 1000 year reign. So the JW paradise isn't going to be as carefree as they think!
The operative word in the verse being "practiced" - not one-off sins.