I'll debunk your first statements about disadvantages.
1) Gambling brings you loneliness, or makes you feel alone or want to be alone, it can isolate you from society or from other important events in your life.
No it's not, you can socialize with other people in gambling, talk about gambling, there's a lot of players in this world that's always in the casino. You can interact with them and make them as a gambling buddy. I don't think gambling brings loneliness, 'cause when you're betting to a game, there's an excitement and thrill because you're hoping to win it.
2) It can suck your energy or your happiness, it can get inside your head and won't leave you alone until you gamble again.
It's a true disadvantage, you can also insert here "
addiction". The real disadvantage and the root of all is addiction, if you're addicted on gambling, it might ruined your life and everything so we must have a control when gambling.