It's not hard to find examples.

"You cannot bring a firearm loaded with multiple magazines to any sort of protest that you want. It's that simple."

- Kash Patel

“I don't know of any peaceful protester that shows up with a gun and ammunition rather than a sign."

- Kristi Noem

“With that being said, you can’t have guns. You can’t walk in with guns. You just can’t.”

-Donald Trump

And are these really 2nd amendment advocates to begin with? They don't strike me as principled people in general.

If you mean to say that officials in Trump's administration are hypocritical, then say that. But many are accusing thousands of rank-and-file gun rights supporters of hypocrisy on a thin to nonexistent evidence base.

Here's how one gun rights group responded to some of the statements you quoted:

https://xcancel.com/gunrights/status/2016268309180907778#m

https://xcancel.com/gunrights/status/2015572391217467562#m