So let me re-phrase the WT article:
Those damned Catholics try to say that they will not make a hard-fast rule that gambling is a sin. They only say that it can become a sin if it causes one to neglect their duties. Those damned Catholics don't even use the scriptures about gambling being a sin to prove that gambling is not a sin. Watchtower knows that those scriptures don't exist, but we find plenty of scriptures that we can twist to make it seem as if the Bible says that gambling is a sin.
The Bible doesn't always make specific rules about specific subjects, but gives room for the reader to understand what God really thinks. Don't worry about that. Those damned Catholics expect you to figure out whether your gambling is a sin or not by the way you understand what God really thinks, but here at WT we don't leave that to chance. We expect you to realize that what we say about gambling is what God really thinks. We'll avoid the direct word 'sin' so we seem to be not going beyond what is written, but c'mon people- God hates gambling. We know. Do what we say.