they still needed to clear his room, because they didn't know if there were more people in there that could pose a threat to them. again, remember that they were called in on a person pointing a rifle out of a hotel room.
The police clearly went in unprepared then, they could've had a few extra officers, maybe a few going in different ways, but they didn't and they sent in the officers that were there, who still could've cleared to room whilst the man was being cuffed.
Just because they didn't know, doesn't mean they can't attempt to find out.
Also tony the man put his hand down, then the police shot around a second after, is that really him pulling a gun?
Your logic seems to be always flawed, you like to always say "well people said this but then they complain about it... wtf world!?!?"
Again, they had many chances to attempt to clear the room, cuff the man, search him and all that, but they painstakingly tell him to do specific things, and because he didn't comply they shot him.