I didn't say gambling should be a priority in someones life, but if someone enjoys gambling recreationally and is able to discipline oneself then it is not a problem. Just because someone gambles that does not mean someone encourages others to become addicted to gambling.
People should do good works, but they should also have fun and enjoy themselves.
With the freedom we have in Christ comes greater responsibility:
Romans 14:
All food is clean, but it is wrong for a person to eat anything that causes someone else to stumble. 21 It is better not to eat meat or drink wine or to do anything else that will cause your brother or sister to fall.