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Risks and benefits. There are very few severe adverse reactions to vaccines. Yet some will die after receiving one. Do we now allow infectious disease to kill and maim instead? No, we weigh the risks.
If we can get the same benefit with lower risks, like asbestos replacements, we do that. Still better than dying in a fire, though.
yeah exactly what I was getting at. While we did not have good alternatives we kept allowing its use with regulation to make it as safe as possible but then as alternatives became available its usage was increasingly curtailed which is why it took so long to ban. Although just in time since I would not be surprised if todays health agencies recommended adding it to breakfast cereals.