No one did. This is a democracy.
https://www.canada.ca/en/canadian-heritage/services/flag-canada-masting-rules.html
16. Exceptional Circumstances
In exceptional circumstances, and on the advice of the Department of Canadian Heritage and the recommendation of the Clerk of the Privy Council, the Prime Minister may approve the Half-masting of the Flag on the Peace Tower, and/or on all or some federal buildings and establishments in Canada or abroad, that is not provided for in the Rules.