You're probably right, but sometimes the correct course of action is for congress to do whatever it is they would do if our political system was functioning normally. Kind of like how it was worth impeaching Trump over his post-election behavior even though we all knew it wouldn't result in his removal from office. Let's have the adults go ahead and model what normal government looks like and make a note of who's throwing the monkey wrenches into the process.
I suppose - but, this is one of those things I think is best done quietly by an "independent" group.
1. Why did this happen?
2. What should we do to be more prepared in the future, to either prevent this, or to better control it?
We already know, largely, why this happened. And, I don't know that I would change anything there. Politicians are going to appeal to their base, and the base will react - I think that is a universal truth, and an off-shoot of having a democracy.
In terms of how to prepare, I don't think that has to be political - in fact I am pretty sure it should not be political.
In this case - what steps were taken by Capitol Police, in light of expected protests?
What steps should have been taken - in terms of tactics, manpower, equipment, etc?
What was the back-up plan - i.e. when to call in National Guard - how/why did that fail? How do we ensure it does not fail next time?
In a functioning government, I think this should be a very dry investigation, devoid of the emotion and rhetoric that will take place in this committee (on both sides).