Reading again! 
 Mark Miller delivers a dialogue that essentially encompasses civil liberty and privacy. It isn't unsurprising that Captain America stands against the government especially when it comes to declaring their identity to government. "Superhero Registration Act" is passed as law after a (legitimate) public outrage against renegade superheroes. Tony Stark endorses it while Captain America stands against it. 
 Both sides make arguments that are agreeable in a given situation but both fail in large scale of things. Iron Man (even in the movie Age of Ultron) mentions his ability to see future purely by predicting movement of technology and its adaptability over time. But what happens in the end comes entirely out of the blue. 
 People aren't just unpredictable but also behave differently when put in a situation that threatens their loved ones. No amount of intelligence or brilliance can predict that. And that, is the lesson Tony Stark learns the hard way. 
 Reading Spiderman and Captain America are both important to make the arc complete. And of course, Civil War confessions.