"Have you ever wanted to do the wrong thing?"
Scootaloo looked up from her sandwich. "How?"
"Morally speaking," Sweetie Belle replied. "In ways that wouldn't be immediately apparent, of course, and possibly ways that wouldn't have immediate physical consequences or directly harm others in the short or medium term. Things that don't come with an inherent advantage, not mostly born of inaction, if we were counting those then of course, everyone wants to be lazy every once in a while. I'm talking about something deeper, something more grand, but not necessarily outright malicious in ways that would make it easy to identify."
Scootaloo looked down at her sandwich again. She picked it up, bit into it where she'd left off, chewed for a few seconds and then swallowed. She put the sandwich down. "I still don't follow. Do you have something more specific in mind?"
"Something unseen," Sweetie went on. "Something only you know the proper details of. Something no one might ever find, and something that's for sure never going to be traced back to you. Something you can easily lie about. Nevertheless, something evil. Something undeniably ethically unjust, something you know you shouldn't do." She pushed herself up with her forelegs on the table, looking at some imprecise spot above Scootaloo's head. "I think the hidden nature of it is key. The way no one will know. If observed, you have a stronger incentive to do the right thing. When you're not being watched, it's just you and your morals. And yet it's more than that. You wouldn't normally act in evil ways. It's the chance, the possibility. You know you won't be able to when you're not alone. You know you wouldn't normally. That's what pushes you. It's the thrill of defying your own ideals for the sake of new experiences, the rush of dabbling in those waters you so often abhor."
Scootaloo looked at Sweetie Belle. Then she ate some more of her sandwich, while the unicorn didn't move and didn't look in any other direction. "Are you going to eat that?" she asked, nodding towards Sweetie's untouched salad.
"I think some get intoxicated on it. I think the excitement they feel from breaking their bonds, the sense of freedom they experience, it gets to their head. They want more. They believe themselves liberated from the constricting chains of moral impositions, and they believe that freedom is the source of their happiness. They begin to seek more of it. They begin to constantly exercise their newfound so called freedom, convinced it is the key to their self fulfillment. Furthermore they push their limits further, they seek out greater shatterings of taller barriers to recapture the initial spark that led them down the path."
Scootaloo finished her sandwich, then extended a hoof and grabbed the salad. Sweetie didn't move.
"I could stop them. I could stop the issue to its root. An always watchful eye. No one would ever truly be alone. No one would dare misbehave."