Why do some people compare individuals who ignore problems or refuse to face reality to an ostrich with its head in the sand?

The comparison of individuals who ignore problems or refuse to face reality to an ostrich with its head in the sand comes from the belief that ostriches bury their heads in the sand to avoid danger, even though they actually do not. This comparison suggests that people who avoid facing problems are similar to ostriches in that they are not dealing with reality and are not addressing the issues at hand.