People kill people not guns kill people?? Why do some people say this?

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Okay so im just a teenager so please go easy on me.

People who support the right to have guns say this quote all the time but I cant help but to think to myself what a stupid argument.
First off its true that people kill people, but this is how the world is and thats never going to change.
But imo guns do kill MORE people. So wouldnt taking guns away help lower the number of deaths at places with large groups of innocent people?
Some people have made the argument that they should be allowed to carry guns in public places just in case something like the Colorado shooting were to happen. But wouldnt that just make for a shootout? Are we going to have shootouts with civilians against a crazy person at a grocery store now, at a park, at a school now? Is this what we have come to as a society now? when we could just easily take guns off our streets and our neighborhoods?
People say just keep the guns from getting in the wrong hands. But how is that possible? There are over 300 million people in the U. S wouldnt it just be easier to take guns off the streets? Also there are people who own guns that appear to be normal NOW but in todays world any and everyone is unpredictable, look at the Colorado shooter he was in everyones eyes a normal student but look at what he did? You dont have to be just "mentally ill" to just one day have a break down.
I agree that people should have the right to bear arms, but honestly each household imo should only be limited to have one gun. Thats enough protection, there really isnt a need for people to have 3 to 8 guns in one household.
and last, people blame a "society of violence" for what is going. But hasnt society and the world always been violent? dont get me wrong, I do believe violence in movies, music and video games contribute to this SOMEWHAT. But ultimately its a GUN ISSUE. Like I said before violence is not going anywhere but we can change the issues with guns.
No one needs a gun to kill
But most of the time one does need a gun to kill 5 people or more.

And your right guns can be brought from the black market but if there were tougher gun laws most people wouldnt want to buy a gun either way. In my opinion there should be a law where as if someone is caught with a gun, rifle or anything they should automatically receive a lengthy prison sentence and I bet that you will see a change in gun violence.
Btw I dont think buying drugs should be compared to buying guns. Drugs arent killing innocent people and kids all at once.