People travelling and not quarantine leads to more infections and higher covid numbers. In order for businesses to reopen we must get are covid levels down. If you look at the countries that have strict quarantine protocols they have been able to minimize businesses closing. Sure if you were part of the huge explosion of covid cases, including deaths, due to a UK traveller with the mutation you may feel differently.
Then there must be an explanation why people cannot dine in Ontario, whereas in BC, we can go to restaurants and dine at their premises. Whereas in AB, gyms are currently closed and BC residents can still go exercise in gyms.