to not want Stepson living with us?

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Stepson is 30+. Split with his long term GF 3 years ago. He lodges with a friend who is married with 2 kids. He has a full time job. But he drinks. A lot. He is an alcoholic but he claims he doesn't have a problem.
Friend (landlord) now very concerned as when he is drunk he forgets he has put oven on etc. Fire risk etc. He is thinking about kicking him out, but no way is he coming here. We have a spare room, but I don't want him. AIBU?

Friend (landlord) now very concerned as when he is drunk he forgets he has put oven on etc. Fire risk etc. He is thinking about kicking him out

Yanbu!
He'll just fester in your home until he sets it ablaze through his drunken stupidity!
He's living in denial and needs a sharp shock to face reality and get the help he needs.....he does not needs people enabling his acloholism.

Sounds like maybe it would be more helpful to try and get him rehab or something?