You should read your own suggestion there bub. It merely says there are proponents and critics of the theory and that actual research on the metaphor is sparse. Sorry to get your panties in a twist.

I’ve seen the “tolerant left” suggest calling ICE on latinos who supported Donald Trump in order to get them or their family members deported as some sort of revenge. If that’s not a fine example of horseshoe theory, I don’t know what is.