No. "Valid" is not the word.

"Legal" to a point, and then abruptly lethal to those who escalated it to violence and crimes against the nation. (Yes, that means that, by the book, Trump should already have swung for this alone.)

That wasn't a protest, it was an attempt at a government takeover and overthrow. It was an attempted coup, with a whole list of people to install that were never voted into office. That's not a protest. Maybe protesting is part of that, but that's not a protest.

Questions of it being valid or not don't apply to things that are not protests.

Well it was a mostly peaceful protest after all