In 10 years, I have never seen Cruz that rattled. His comment was an unnecessary salvo shot at his base.
Truly puzzling he would say this a year later with so much evidence mounting that this was a false flag event.
In any case, it was political suicide on an epic scale.
The only reason I can see using the language of the Left in this case, is that if it is established that Federal agents, contractors, and infiltrators were used to incite the riot, acted in the destruction (such as it was) and encouraged unlawful acts, not only can the case be made that those actors were co-conspirators in fomenting this "insurrection", but should be held accountable for doing so. Using the language of the Left would underscore the very types of charges that could be brought, along with entrapment.
From the limited amount of video available (compared to the full 14,000 hours yet to be made available for scrutiny) it is apparent that without the compliance and assistance of those tasked with keeping the building secure, any invasion of the building would have been limited, if it occurred at all. How much of that was facilitated or done by Federal infiltrators remains to be seen.
That, however is a gambit that can't be displayed in the press, should it be in play, until the seditious and other unlawful behaviours of the Left and their assistants in Law enforcement and other agencies is exposed.
Keep in mind that the opponents in this case are people who created the whole Russia/collusion case from the get-go and used that as the cornerstone of opposition research into a candidate and the ensuing dog and pony show leading up to impeachment at great expense to the taxpayers.