As others have pointed out, the explanations have existed but perhaps not in your view. From where I stand (Seattle, know multiple Defund folks), the reaction

As others have pointed out, the explanations have existed but perhaps not in your view. From where I stand (Seattle, know multiple Defund folks), the reaction has been "So, the one true thing we think cops should do - prevent significant violent action and protect people - they failed at. This further proves our point". You can dither on whether blocking traffic is violent (it's not) but the events really only strengthened their case - BLM peaceful protesting is met with an order of magnitude more violence than actual attempted attacks on the government. So why bother having cops if they don't do anything when it actually matters?