So why did I open this topic? I just want to know will lawyers can do something against this? or Are their actions against cryptocurrencies justified legally?
Hi there! I do see a lot of good questions here. I'd like to take up one of the question being the property right. In this case, most governments don't give right to property in full i.e. your property can be seized by the government at any point in time if they find a genuine reason to do the same (though certain constitutional remedies maybe available). For example: In US, the right to a person may not be deprived of property by the government without “due process of law,” or fair procedures. This does mean that government can seize your assets if it follows due process of law.
Also, I have written an article on grounds to be taken in case of government action against cryptocurrencies here: https://bitcointalksearch.org/topic/m.56908197 . It is a quick 5 min read wherein I have summarized the strong contentions/ground one can put forth before the courts.