I don't think anyone is suggesting that Riley was getting into fights or being combative. I think they were saying his extreme inebriation was putting other people at risk. Imagine a 6 foot 7 individual losing his balance walking up the stairs. He could have bowled over several other patrons in falling down the stairs. I don't know that he fell down the stairs but when I see how fast he was moving and his erratic arm movements in those videos he could have easily socked someone in the face unintentionally.
The reality of it is that Riley was really drunk. There's no getting around that. His friends chose to let him leave by himself. If I was his mother, I would think out of the two choices who should have had Riley's back, it would have been his friends, not the bar management to call him a cab, find out where he was staying and send him on his way. Even if he had gotten back to the hotel he didn't have any key to get in the room. And if his hotel was like many hotels, seeing an extremely drunk person entering their place of business without any ID or proof that he was staying there, he may have been given the boot there, too. I'm not sure why so many people don't understand that. Restaurants, bars and hotels are in the business to make money, not to endanger their patrons or staff members or being a virtual babysitter for some unknown quantity.