Yeah, its always easiest to just make up an example that never happened. SPLC didn't defend Antifa as just wrongheaded.

It just doesn’t designate them a hate group because they, whatever else they might be, aren’t about the kind of discrimination that SPLC uses to define a hate group (nor, despite sometimes being at odds with government, are they centered on the kind of anti-government ideology that SPLC defines its catalog of anti-government extremist groups with.)

Ironically, what SPLC is beinf criticized for with Antifa is actually having specific meanings for its designations rather than arbitrarily applying them to everyone it disagrees with.

> If you're claiming to fight extremism you should also fight extremists that support your political views.

The SPLC does not now, and never has, claimed to be a force of generic moderation fighting generic “extremism”; its mission has always been to fight for racial justice and specifically against white supremacy. (It has since 1990 tracked hate groups and antigovernment extremist groups, two sets which overlap and which it has observed are influential in the issues it fights against, but the definitions used and purposes of that have always been, quite openly, shaped by and in service to it's primary mission, not orthogonal to it.)

And, having said that, they do include in their catalogs grouos meeting their definition that purport to be aligned against the same things as SPLC, like the New Black Panther Party (which is both listed by them as an “anti-government extremist” group and a “designated hate group” by SPLC.)