Government Mandated Vaccinations - What Gives Them The Right?

We sit down and discuss issues involving government mandated vaccines. Do they have the right to make such a declaration? Who would be involved? Are they even safe? Is it right for the government to impose a 2 week self isolation for a new arrival into a country? Also with the recent pandemic, should western nations allow foreign companies to manufacture, manage, and run our tech infrastructure? We ask the questions.