What's with the mercury?

There is no reason why mercury is ever in any products that are inserted or injected or accidentally administered to the human body. The government has agencies like the CDC that are supposed to act to keep us all safe. Mercury is an unsafe product and yet it appears in eye drops. It appears in dental amalgams and it appears in vaccine. Yes, it still appears in vaccines. Let's be clear about it, mercury is an insidiously toxic substance, and it destroys the ability to even remember that you have been exposed to it. Mercury has been toxic and will be toxic. It is a substance that avoids detection after ingestion. In short why is it still in use in medicines and other products used by humans.