I think the main takeaway is that governments are making a strong case for an alternative, decentralized currency: * preventing transactions they don't agree with * inflating savings away * freezing bank accounts of adversaries * seizing cash at security checkpoints
Moreover, aside from inflation, the other abuses you list are essentially abuses of power and if governments maintain power - their official monopoly of force and violence, they will continue to be able to engage in these other actions.
EI, I don't think there is any imaginable electronic currency that couldn't be "taken" from you if a group of armed men burst in, seized your computer and demanded your passwords. And if bitcoins became ubiquitous, the state certainly would believe that you owed taxes on your bitcoin transactions and it would send it's armed-men to collect.
Edit: grammar