Someone calling for less guns or no guns explain why there were no mass shootings in US history until 1965 with University of Texas and since then- more than 50 years- there have probably been more than 50 mass shootings? As many violent, savages in US history, no one thought of shooting up a school house. Why? Because even the evil back then did not think to shoot up innocent children. Further, the teacher had a shotgun in the classroom.
If someone is intent on committing a mass shooting of innocents, with the gun laws in place today, they can be pretty certain more than 95 percent of the people they are going to shoot are not going to return fire. What if 25 percent of the people were likely to return fire?