Can Biden's inauguration be kept safe?

When President-elect Joe Biden is inaugurated on Wednesday, he’ll take the oath of office while standing on the very steps that were overrun by a violent mob of Trump supporters just two weeks earlier. Right-wing extremists online are plotting ways to repeat their assault on the U.S. Capitol, potentially on a much larger — and far more deadly — scale.

Concerns over another insurrectionist attack have led to a substantial increase in security precautions ahead of the inauguration — an event that already has a massive security footprint in a...