There were 'restrictions' on the 2A before one single gun law was ever written. These restrictions were regarding the use of arms. They include murder and assault. When people broke these laws government somehow decided that more laws, ones that infringe on our RKBA, would some how fix these problems. They did not. They did manage to leave more law abiding people at the mercy of criminals. No gun law will stop evil people from committing horrific crimes, but armed citizens will.