I would suggest reading the full book. Most of these questions are answered. Also you just described the police state in many jurisdictions. I understand your concerns. I have them as well. The simple answer is competition. I would rather have many smaller tyrants vs. a bigger more powerful one.

I argue that the reason we do not have more opposition to the state is that people believe it is special and different from individuals and companies. If a company were to do many of the things governments do there would be outrage. When a company does something terrible people stop giving them their business.

I'm not trying to score points here. Bob does a great job answering many objections you list and many more you didn't. Also, he's not alone. There are much more extensive writings on these topics.