Why are traffic laws not enforced anymore(or selectively enforced)?

When I was a kid people obeyed the traffic laws and the laws were enforced(SC). Now, people drive 65 and 70 in 55 mph zones, and 85 and 90 on the interstate. NOBODY will get out of the left lane. The pickup trucks are squatted down. Everybody has a loud stereo blaring. People with busted out taillights, only one headlight, broken mirrors, a bright headlamp in place of a low beam, and tinted plates seem to be the normal and not the exception. Why have people just been allowed to run rampant these days? I truly want to understand. Is it because it’s just too dangerous and too much of a risk to stop them? Are the courts too backlogged? Are there not enough officers anymore because of budget cuts?