The Threat is Real, very real.

[HowaGrendel]

To be fair I don't think the average police officer carrying iron-sight AR15's at the venue could have done much, if anything.

It is 150M from his suite to the corner of Las Vegas Boulevard and Giles St. Another 150M to the centre of Las Vegas 'Village', which is where the Route 91 concert was being held. That is 300 metres (Ref; Google Maps). Wikipedia is claiming he was shooting 400yds or 365metres.

Looking back from the venue to his suite is 32 stories up. Using the standard height calculator for a hotel I make it 108M up. That extends the distance from 300 to about 320metres.

Police shooting back from ground level and correctly estimating the range to his windows will need to account for the angle, 20degrees. The cosine multiplier for that angle is 0.94 so 320 metre angled shot becomes equivalent to a 300 metre level shot.

Wind speed according to national Weather Service was averaging 6.4mph on the day from the NE, so no practical influence to either shooter or police.

Factor in a whole bunch of people in adjacent hotel rooms probably at the windows wondering what's happening and that is where a long difficult shot with iron sights becomes potentially deadly to civilians. While he can blaze away into a packed crowd any Police shooting back with long guns would have to be a whole lot more careful.

So you are saying the LE who may have had rifles kept under cover or did not have any skills to at least try and disrupt shooter by firing back ? An AR15 in the hands of someone trained can be very effective at 300, hitting a man sized target is not too difficult, so hitting in his general area and slowing him down was very possible....that fire would have also helped the LE who were working towards the room before they went in.....up to that point people were already dead and dying....LE would not been have spraying the whole side of the hotel, they knew where the fire was coming from....the window lickers looking down would have quickly run and hid if a bullet did hit close...If they could not figure out someone was shooting down on the crowd and then be smart enough to get away from the windows ? well you can't fix stupid.....I would like to think several LEO's should have been trying to at least slow down the shooter....maybe a LEO did shoot back ? time will tell IF we ever get the truth....