How are vaccines bad for you?

how are vaccines bad for you?
They have horrible substances in them like mercury, which is one of the most toxic chemicals on the planet. It causes diseases such as cancer, SIDS, autism, many more, and the worst being death. And in Countries all around the world are actually banning vaccines because of all the dangers. My stepdad is a chiropractor and he is an expert on how to keep your body healthy. Vaccines are NOT the way to go!!!!!!! Please educate yourselves people!!!!!!! then you will notice how oblivious a lot of people are to all the dangers of vaccines