They know that if they reform the law and make it harder for people to access guns, people will still find a way to get them. They just hope that certain people can't get them that easily. BUT! Also, law abiding people can't get them that easily to protect themselves.
The law is never the issue. It's always education. People usually commit gun crimes simply because they are uneducated on the lack of value that comes from it. Looking at the data, most the criminals that use guns ARE NOT SMART... Not even close. That's the real tragedy.
So no, the Senators know that the real issue is deeper. You don't give someone with cancer a band-aid. Same with this... Don't cover up a symptom instead of addressing the disease.