Even if Las Vegas police did get there in under five minutes as some insist they should have, my guess is they arrived on scene in less than 7 minutes, could they have realistically stopped the gunman with an AR-15 capable of firing off 800 rounds per minute? They are definitely splitting hairs when criticizing LVMPD's reaction time in my opinion. Here's what firing off rounds at this rapid rate of fire looks like just to show that no matter how fast the first responders got there, they didn't stand a chance: https://www.youtube.com/watch?v=T5UpAcMR1dI