A caveat, though...I believe the goal shouldn't be to understand as much as a practicing lawyer. In general, I feel the goal should be to simply learn enough to not inadvertently break laws or unknowingly support illegal acts.
With those points in mind, I think US citizens normally have a #CivicDuty to educate themselves about US law over the course of a lifetime. That is, they should regularly invest time in developing legal knowledge as they progress through life.
2 of 3