It´s a funny thing; security apps are incredible unsafe and easily mocked or removable, then to post I found that the data can be deleted for any user.
Maybe you´re not familiar with but probably the best would be unlock bootloader, root it and installing a custom rom (I ever do this) in this way the app Security Center is easily controlled. Or installing a different rom by i.e. an AOSP where this app is not present.
You also can delete it using adb but probably this get in other troubles so is an in-built system app on Miui firmware very dependent of. For this It has to be considered which other apps work with so they have to be also deleted to not cause conflicts.
Finally freeze it, hide it or disable it is not an option when someone else is determined to break with. Your last resource would be delete it then to unlock it, root it but again I don´t want to anticipate before you try it but probably device will have a back-door that can be exploited for a smart user stubborn to break the rules.