Primarily because you are not preinformed for the search. There is an expectation that your luggage may be searched, hence you dont put your favorute fetish items if you are easily embarrased. Most people don’t expect to have their sexting history searched (and possibly easily copied). Even if it has become legal, it is not a widely known practice, which means that in practice it violates human rights. Someone should take this to court, even if the only gain to be expected is Making it widely known, and -hopefully- people will stop voting to enable these authoritarian practices.