I think that's largely an attribute of the US legal system. The debates about legislation last so long and cost so much political capital that legislators are wary of making more frequent but smaller changes to laws.

Also, a law is not always needed. Frequently culture and society have ways to discourage problems created by outliers without turning to new laws. The problem occurs when issues (like conspiracy thinking and lack of trust in long-lived institutions / "the establishment") start to move from outlier status to mainstream.