[azernik]

The government doesn't require a warrant to take your property by taxation or for eminent domain.

The government doesn't require a warrant to prevent people from entering or leaving the country.

The government doesn't require a warrant to block off city streets or do any of a number of things to public property.

The only things that the Constitution requires the government to get a warrant to do are "search and seizure", which are terms with very specific meanings in the Common Law. The NSA somehow argues that intercepting people's traffic isn't a "search" until an analyst actually looks at it, which I think is a ridiculous argument; however, the response isn't "everything you do needs a warrant", but "that's a search, and searches need warrants".

[Amadou]

Your examples are just word games. The intent of a warrant is oversight, all of those examples require oversight, some more so than others, but all of them require some sort of accountability.