> It's similar to how a house fire can spread to neighboring houses regardless of the homeowner's preference to have it put out or not. If I can make my house

> It's similar to how a house fire can spread to neighboring houses regardless of the homeowner's preference to have it put out or not. If I can make my house fireproof (analogy of being vaccinated) then I would not worry about my neighbor house not being fireproof catching fire and spread.