Here is how the conference and the law is passed in Equestria Civil War.
(we see ponies and other royals filling up the meeting room)
Nighlock(in tuxedo):(walks in and up to Shining Armor) Shining Armor. Glad you're here.
Shining Armor: You too. So, representing the Mutant Republic?
Nighlock: Someone has to.
Shadowcat: But he's not alone.
Princess Cadence: Kitty.(hugs her) Love your dress by the way.
Shadowcat: Thanks. How's Skyla?
Princess Cadence: She's doing good. How are Jess and James?
Shadowcat: They're fine as well.
Announcer: Attention everyone. Please take your seats, this meeting is now in session.
(cut to Celestia giving her speech)
Princess Celestia: Citizens of Equestria. I call you all here today for one reason.
[she pulls out the Reformed Villains Accords]
Princess Celestia: Some of you in this room believe that Twilight Sparkle has been too soft on any and every villain who has ever been reformed. The solution is right here.
[she pulls out the Accords]
Princess Celestia: The Reformed Villain Accords will ensure that any and every former villain is kept in check.
Shadowcat:(stands up) I object.
[everyone turns to her]
Shadowcat: Are you people seriously going to follow her on this one. Don't you people see how wrong it is. All because Starlight Glimmer made one little mistake.
Chief Thunderhooves: I disagree with the law as well, Mrs. Tavary.
Princess Celestia: And how many people have you killed, Agent Tavary?
Nighlock:(bangs his fist on the table and gets up) That's out of the topic here! You're changing the subject!
Shadowcat: He only kills people when he has to! So back off!
Princess Celestia: Starlight's mistake resulted in 26 ponies injured.
Nighlock: Haven't you heard the term, "Innocent people get hurt all the time"?
Princess Celestia: Citizens of Equestria, I beg you to see reason. Do not forget how Discord betrayed us for Tirek.
Nighlock: And also don't forget, that he was betrayed by Tirek, which completely reformed him. The future isn't always truly set.
Random Royal: I say we sign these Accords into law.
Penn Zero: Agreed.
Apploosan Sheriff: Why should we trust them verments?
Princess Celestia: All in favor of the law?
(Everyone, minus Thunderhooves, SA, Cadence, Sunburst, Nighlock, and Kitty, raise their hands)
Princess Celestial: Then it is decided. The Reformed Villains Accords will be passed into law.
[angered, Thunderhooves stormed out, while, SA, Cadence, and Kitty walk out sadly]
Nighlock:(applauds mockingly) Well done, Celestia.(in Discord's voice) Harmony in Eaquestria is dead.
(everyone stares at him in shock as he leaves)
Princess Celestia: Then you are no longer welcome here.
Nighlock: Believe me, traitor, I will fight this law.
(he telekinetically closes the doors behind him)