I don't have more information on this particular company's dealings with law enforcement, but I certainly think it's reasonable to be concerned.

I see your point, if the company is ok with handing data without a warrant, then they might as well be a surveillance company for the police. That may or may not be the case for these companies at the moment, but there's nothing stopping them from changing their mind tomorrow.

I also think most cars can't be stopped dead with a traffic cone, so these protesters are highlighting the unpredictable and sometimes dangerous behavior of these vehicles in mixed traffic.

This is another fair point, and I think you're right that it does highlight a deficiency in these vehicles.

I think self driving tech has a lot of potential to save lives in the future if it can perform better on the road than humans. But I do agree with you now that maybe it's good that the protestors are highlighting some of the glaring issues that are popping up along the way.