>The protesters are locking the government and many US and Canadian systems out of the ability to travel between the countries or engage in many types of free commerce.
If you think those actions are illegal, the correct course of action is to prosecute them under the normal judicial process, not to shut them out of society "nosedive" style. Murderers and rapists do worse but even then we give them due process.
>They haven't confiscated the money, they have simply frozen the accounts, effectively saying "block our commerce, we block your access to money to support your actions."
As was stated in the OP and my previous comment, the argument here isn't that "this protest is legal and should be allowed", it's "if the protest is illegal, the government should go through the normal legal channels (ie. courts) to shut it down, rather than having the executive branch unilaterally dish out punishments.