1966, University of Texas. Charles Whitman climbed the 28 story university tower and began shooting people.
Soon citizens on the ground grabbed their rifles and returned fire.
An off duty deputy sheriff and two civilians climbed the tower and ended the rampage
49 were shot before the sniper was killed.
Today the police would have spent hours clearing the area (and maybe arresting those that fired back) and then assemble a hundred men swat team before they decide to drop a bomb on the tower killing the shooter as well as destroying the building.
The death toll would have been much higher
You didn’t say how many dogs might have been killed!
If I remember the tv movie dramatization, the LEOs on the ground said the civilians had better firearms, that is, capable of reaching the top of the clock tower with some punch.