Should the internet’s most controversial law be repealed?

President Trump on Wednesday vetoed a massive $741 billion military spending bill that had passed with overwhelming majorities in both houses of Congress. One of the primary reasons Trump rejected the bill was that it did not include a repeal of an internet free-speech law known as Section 230, a once-arcane piece of communications legislation that has become a flashpoint for controversy in recent years.

Passed as part of the Communications Decency Act in 1996, Section 230 protects online entities like social media platforms and other websites from liability for...