I am curious though what the frame of reference is for someone who cheats on the assignment where they promise not to cheat.
Perhaps there are people who make it through life with a sense of learned helplessness or even possibly a cultural mandate - basically, something that represents a higher authority to that person than the Western standard of justice, ethics and fairness.
I'm fully in favor of true justice, shared ethics and fair and compassionate treatment - that's a conversation for another time.
If that's not reality for that person, then to have a teacher attempt to engage with them seems more likely to have an impact on their success in a Western society. I'd guess that failing them and possibly expelling them would not.
I'm curious what you think?