I can't think of a program more dangerous than one which intercepts and has option to receives every byte read from the filesystem -- while also having its own

I can't think of a program more dangerous than one which intercepts and has option to receives every byte read from the filesystem -- while also having its own arbitrary network access ... the idea that employing such a tool could ever be better than _not_ having that tool is wrong at such a fundamental level that I don't understand how our computing society allows it to go on ...