The 911 was careful not to order him to stand down.
The 911 operator told him to let the police deal with the situation. That is all the English I need to understand that he should have minded his own dang business.
They said police would deal with it. They did not put the rhetorical fillip you claim in (to “let them deal with it” like he could stop them).
Also not everyone just lays down and hits snooze when the cops are supposedly on the way. Most Freepers don’t. Zim, oh naughty Zim, he stood there and looked! What shall we do about this horrible temptation to Saint Tray?