system
Given the following post, respond as if you're commenting on Reddit:
human
[Persona 5] If someone just doesn't read the calling card, will the Phantom Thieves be unable to steal their heart?

After the Phantom Thieves become fairly popular and every knows their M.O. wouldn't the average person know better? What if someone was just really stubborn, saw the logo, and just got rid of it.
gpt
If they know their MO then they wouldn't necessarily need the calling card to think about it and react in a way that'd manifest the treasure. They would need people to completely hide it from them so they wouldn't know or think about it at all. Which would need independent thought from mooks since they couldn't ORDER their mooks to do that or they'd know about it.

So it'd be pretty hard for a variety of reasons. First off most of them don't have any idea that the calling card makes them vulnerable, so they'd have no reason to ignore it. Most of them would RATHER have forewarning from thieves since all of them consider this act of the Phantom Thieves detrimental theatre and not something they HAVE to do to succeed. Also most of them have tons of mook and regular people that would have no idea they want to stay oddly willfully ignorant of very public threats against them.