It has something to do with the fact that you can't create an "island" of gun restrictions and control. Why is there still gun violence in D.C., for example? You can literally WALK from Virginia, a USA gun haven, into Washington D.C.
In 1991, Ronald Reagan said at a ceremony at George Washington University: “I want to tell all of you here today something that I’m not sure you know. You do know that I’m a member of the NRA. My position on right to bear arms is well known. But I want you to know something else. And I’m going to say it in clear unmistakable language. I support the Brady bill and I urge the Congress to enact it.” And while Ronald Reagan was the Governor of California, he stated his view on guns in May of 1967 when Black Panther Party members walked into the California Statehouse carrying rifles to protest a gun-control bill. “There’s no reason why on the street today a citizen should be carrying loaded weapons.” Former Nixon speechwriter, William Safire, wrote in 1999 how Nixon felt about gun control. “His on-the-record reply: ”Guns are an abomination.’ Free from fear of gun owners’ retaliation at the polls, he favored making handguns illegal and requiring licenses for hunting rifles.”
Dear Mr. Washington, I was outraged when, even in the wake of the Oklahoma City tragedy, Mr. Wayne LaPierre, executive vice president of N.R.A., defended his attack on federal agents as "jack-booted thugs." To attack Secret Service agents or A.T.F. people or any government law enforcement people as "wearing Nazi bucket helmets and black storm trooper uniforms" wanting to "attack law abiding citizens" is a vicious slander on good people. Al Whicher, who served on my [ United States Secret Service ] detail when I was Vice President and President, was killed in Oklahoma City. He was no Nazi. He was a kind man, a loving parent, a man dedicated to serving his country -- and serve it well he did. In 1993, I attended the wake for A.T.F. agent Steve Willis, another dedicated officer who did his duty. I can assure you that this honorable man, killed by weird cultists, was no Nazi.
John Magaw, who used to head the U.S.S.S. and now heads A.T.F., is one of the most principled, decent men I have ever known. He would be the last to condone the kind of illegal behavior your ugly letter charges. The same is true for the F.B.I.'s able Director Louis Freeh. I appointed Mr. Freeh to the Federal Bench. His integrity and honor are beyond question. Both John Magaw and Judge Freeh were in office when I was President. They both now serve in the current administration. They both have badges. Neither of them would ever give the government's "go ahead to harass, intimidate, even murder law abiding citizens." (Your words) I am a gun owner and an avid hunter. Over the years I have agreed with most of N.R.A.'s objectives, particularly your educational and training efforts, and your fundamental stance in favor of owning guns. However, your broadside against Federal agents deeply offends my own sense of decency and honor; and it offends my concept of service to country. It indirectly slanders a wide array of government law enforcement officials, who are out there, day and night, laying their lives on the line for all of us. You have not repudiated Mr. LaPierre's unwarranted attack. Therefore, I resign as a Life Member of N.R.A., said resignation to be effective upon your receipt of this letter. Please remove my name from your membership list. Sincerely, [ signed ] George Bush