Could someone help me write a thesis statement for the following topic:

"Our school should be free of all weapons including the guns carried by a police officer."

So far this is what i have for a thesis statment.
"Although having police officers in our schools has proven a success rate in the decrease of violence and bullying, armed police is not a solution but rather an admission of failure to address developmental and emotional problems amongst our teens."

I need some help because i feel this is too specific and not complex enough.