Yes even bacteria have their place in the greater scheme of things. The bacteria in our stomachs are vital for our survival, without them we couldn't digest our food or absorb any nutrients from what we eat, everything we excreted would be in exactly the same condition as when it went into the other end. In short we would die without bacteria.  

Without soil bacteria nothing in the earth could decompose, it would be pointless burying our loved ones in cemeteries because they would still be there a thousand years later with nothing to decompose them.

The world would be a very different place without bacteria, in fact we wouldn't be here.