"The knives fact is correct,"
Knives kill triple the number of people as guns?
Here? In America? That would suggest that more than 36,000 people per year are murdered with knives. Are you high?
"I really do not understand what you mean by better regulation ... If it is a right protected by the constitution in terms of how the US Supreme court interprets things"
Well I'll give you credit for honesty. I believe you "do not understand."
Given our 230 years, the individual right to bear arms is a very recent interpretation of the 2nd amendment by the Supreme Court, and even at that, Heller allowed that regulating them is well within the law, even if banning them isn't. For chrissake the damned line starts with "A well-regulated..."
I'll go you one better on that. Article one Section 8 specifically gives Congress the power to provide for the general Welfare of the United States and “To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof.”
Public safety is well within Congress's power to regulate even if they don't presently have the will, or are just too bought off.