I'm really confused about your statement, You said that Gambling is a evil hobbit but gamblers are not evil. Everything that do a evil hobbit is also an evil. Not the evil creature but people that doing sin. Actually, Gambling are not mention to the bible but there are context that pointing to it. Here is some reference for clarification:https://bible.org/question/why-gambling-wrong.
But this thread was a case to case basis of an answer, For example, For religious people, Gambling is a sin because it is against their doctrine, While for gamblers, it is not a sin because this is just their hobby. We can't convince everybody based on our own opinion.