On the contrary, many of my friends do in fact need to be reminded about the rules of the road quite often. Police officers make quite a killing on scolding people who think they don't have to obey these rules when they have no overseer watching them;. If there was no threat for wrongdoing, apparently it wasn't the case for Ananias and Saphira. All they did was lie about the value of their house and they were struck dead.
Regardless for what reason Christians do or don't do good or bad things, the text is quite clear that you must do good things regardless and avoid bad things to enter the Kingdom. Even Paul says this, he just has a different opinion about the Law of Moses itself but still has his own idea of the "Law of Christ" which he exorts believers "to fulfill".
"And the dead were judged according to their works".
You can try to dodge it all you want, but the text itself does in fact put "good behavior" and lack of bad behavior as a total prerequisite for the Kingdom. Many anti-works theology types may try to deny this by ignoring or reinterpreting (twisting) the verses that most clearly say this, but it's true regardless: Half of the things Jesus says are about how your actions all play a role in your judgment, whether you do the good deeds because you "love god" or not, and I've made a great deal of "Christians" who are otherwise not-nice people, especially those who put the most emphasis on their anti-works positions.