No I think mostly only the police should be allowed to own guns. Security people should not, if they need guns for something they should call the police.
LOL. Okay, dude. You're naive, at best. You trust the police? Apparently you haven't been paying attention lately. The police, who are now using military surplus on people in the streets, that are never held accountable for excessive use of force? The police, which the courts have already established have NO obligation to protect anyone?
Here's a clue for you: this will never happen. Banning guns starts with the debate on who will actually have a monopoly on having guns. It will NOT be "just the police". There are many armed bureaucracies that will NOT give up their guns. The FBI and everyone under Homeland Security, sure. But also the Department of Education (did you know they have their own SWAT squads?), HUD, Health and Human Services, the Department of Agriculture (which also has their own SWAT teams, they use them for raiding illegal raw milk producing farmers, among other things), the State Department (of course), and Commerce (yep, armed). There are numerous state bureaucracies that also have armed teams, including Alcohol bureaus and DMVs. All these folks will NOT be willing to give up guns.
Most private security companies are run and often staffed by military veterans and retired police, and none of them are going to give up their guns. And the wealthy and the elites that hire them will make sure they never have to. Because, yes, your rulers do not want you to have guns, and that's the rulers in government and the rulers not in government. Do you think the banks are going to go along with having their money and assets transported around by unarmed guards? Your government cannot function without the banks, there is no way they will disarm the banks and their security folks. You're going to tell them "Well just call the cops." Good luck.
Of course, we're just getting started. There will be MANY groups clamoring to be part of the monopoly-allowed-to-have-guns, many of them with money and influence, not to mention the weapons manufacturers themselves. One of the few productive exports the US has left is weapons - you think they will give that up? Oh, then you get to try to figure out HOW those powerless, not wealthy, and non influential people will be disarmed, and WHO is going to disarm them. Break out the popcorn - it's going to be fun.