Because of the people who encouraged and supported her.
America avoided the potential dangers that Bradbury seems to fear by staying true to the rights in the Constitution. America doesn't fear people who have knowledge and can question ideology, if anything they encourage it. And that is how America avoided some of the potential dangers in Fahrenhiet 451.
The stage of moral development Kohlberg would most likely say that Lu is demonstrating is:
D. Conventional stage.
According to Lawrence Kohlberg's theory, there are three possible moral development stages:
1. Pre-conventional
2. Conventional
3. Post-conventional
The one that matters most to us here is the conventional stage of moral development. This is when we internalize the values and rules modeled and taught to us by adults.
At the conventional stage, we do not question authority. We accept what we are told we should or should not do.
This is the stage where Lu is at (notice that the name Lena also appears in the question). She has accepted the fact that vaping is illegal, for that reason, is not going to do it.
Learn more about Kohlberg's stages of moral development here:
brainly.com/question/8885213
B.
The age of the runner is an illogical comparison, especially when the age is not very different.