I mean, the argument back would just be "Rittenhouse knew it wasn't a peaceful protest and planned accordingly" ... both protests were left wing protests and both murders were committed by right wingers hoping they'd get an excuse to shoot someone.
Also - imo don't try and find inconsistency in right wing talking points, they literally do not give a flying fuck about anything other than "winning" and would spit on their mother's graves if someone told them she was a communist. Today they'll say the sky is blue, tomorrow they'll say it's orange as long as it doesn't mean agreeing with a leftist who also said it was blue.