What will happen to humans if endangered animals go extinct?

The hypothesis has been explored and in theory we could suffer "The butterfly Effect". See "related links" below.

At least that is one theory. What actually happens is we as a species lose any benefit the extinct species offered. Every creature has its uses, either food for another creature or a beneficial purpose to plants and crops. The bee that you swat today may have pollinated thousands of Apple blossoms in its lifetime, thus you deny someone that benefit. The bat someone kills out of fear may someday have eaten the mosquito that carries the west Nile virus that makes someone in your family very sick. Every creature has a purpose. If we are truly the higher life form on earth it is up to us to protect all others.