What Do I Do When Someone I Love Gives Off 'School Shooter Vibes?'

My youngest son is a sad soul and won't seek help. He's just content feeling and acting like an asshole. His coping skills are zero, and it's really wearing me down. I really want better for him. I want what's best for him but right now he's really acting like a hopeless case and today just isn't the day for it. It's Christmas Day for God's sake. Christmas Day. Sigh. Smh.