It is not a matter of trust. Unless you are a citizen your right to remain in a country is always subject to the approval of the government and rules can change. it is the point of the distinction between "indefinite leave to remain" and citizenship.
I have noticed that only white people commit to living in the UK without becoming citizens. Sindhu Vee is very funny about that: https://www.youtube.com/watch?v=s8DNgi5Tok4&t=90s