Why is no one talking about the security failure on Jan. 6?

There are bad people in this world who do bad things. Sometimes they’ll blow up buildings or shoot people in schools or burn down a police precinct or even violently riot at the U.S. Capitol.

When these horrible crimes are committed, some of the questions we ask, especially with assaults on public buildings, are: How could we have prevented it? Was our security sufficient? Did we take the proper precautions?

And yet, no one seems to be mentioning any of these crucial concerns as we review and analyze the Jan. 6, 2021, riots at the Capitol by Trump supporters.

I’ve read countless commentaries o...