Yea I took a criminal justice class, too. My instructor was one of the detectives in the Tate-Lobianco murders. But it's a fallacy to try to portray law enforcement as simply coming to investigate after you're dead. They also respond to 911 calls and tips from the community about crimes being committed.
The ATF, the Bureau of Alcohol, Tobacco and Firearms, will only be coming to my house if I'm stockpiling illegal guns. They will be enforcing the gun ban by investigating and taking the guns off the streets and away from people who are breaking the law, like they do now.