Some people have brought up the fact that all the schools in the Merced Union High School District have a fence except Atwater High School.
Atwater High is the least secure out of all the schools; there are several access points to get in to the school, from the back canals to the front of the school. This would allow anyone at any time to just walk right on to the campus.
I am a student at Atwater High, and in the three years I have been here I have not worried about someone coming onto campus.
The fear is that one of my peers would be the one to do it, and I don't see where a fence would stop them if they attend the school. If someone wants to do something that bad they probably are going to have a plan, and a fence is not going to get in the way.