It’s never a good sign when a public official offers a silly excuse for some unwise action. But it’s especially troubling when the official in question is the NYPD’s top man in charge of counterterrorism.

His name is John Miller. In a Sunday morning radio interview, Miller pooh-poohed a key NYPD report on homegrown terrorists the city is being pressured to take down from the police department Web site.

The 2007 report, “Radicalization in the West: The Homegrown Threat,” was prepared under former Commissioner Ray Kelly and offers counterterror agents key insights into how homegrown terrorists become radicalized.

Such information would seem more critical than ever in the wake of terror attacks by homegrown jihadis in France, Canada and Australia.

Miller claims the report is out of date and has only been downloaded 30 times.

Please. He admits the study is “a good historic document” and “a lot of it is still true in terms of the points it makes.” So why delete it from the NYPD Web site?

Surely no one believes folks want to force the cops to take it down because it’s out of date. The real reason is its politically incorrect focus on “Islamic-based terrorism.”

Miller’s dismissal, moreover, comes at a time when President Obama refuses to acknowledge “radical Islam” even in relation to the attack on Charlie Hebdo in Paris.

Point is, home-grown jihad is a growing threat. If this NYPD report is really no big deal, let’s not take it down until we can replace it with something on the same subject that is a big deal.