Most people are repulsed by cockroaches inside the home, and not without due cause, as they are disease carriers of the highest order.
Outside the home, gardeners also often come across cockroaches under rocks, logs and in mulch. Unfortunately these roaches are undeservedly tarred with the same brush as their indoors cousins and usually end up under a well placed boot.
Australia has in excess of 400 native roaches and very few could ever be considered pests. Most pest species are imported, the Australian Cockroach and couple of others being the exception.