Your parents as well as all elderly people have the right to choose to be vaccinated and move about freely in absence of lockdowns (which I personally am not in favour of though I am compliant).
I don't see why millions of people are denied the right to see their loved ones overseas and are losing the businesses they have spent years on just so a particular demographic can go to Coles, Starbucks and the RSL. It's not just tourism. Tourists go shopping, to hairdressers, use services. It's all a domino effect. Hairdressers lose income so don't renovate their houses, buy cars or stop spending. Then those businesses are suffering. Australia can't go on like this! Our mental health is trashed, this country is spiralling in to a sort of xenophobia which to me is more scary than any virus.