A cursory google search on your part would have easily turned up web pages like these from the central bank of Canada:
https://www.bankofcanada.ca/2020/02/contingency-planning-cen...
https://www.bankofcanada.ca/research/digital-currencies-and-...
https://www.bankofcanada.ca/2020/02/contingency-planning-cen...
https://www.bankofcanada.ca/research/digital-currencies-and-...
Now, why the state would do that, or why anyone would inherently mistrust the state, are open to discussion.