Why did all the convicts start a new life in Australia?

Australia was originally founded as a penal colony; criminals from England and Ireland were "transported" to Australia, as a form of exile. The objective was to get rid of the English criminals without executing them, while building up a self-sufficient colony and British presence in the South Pacific - a strategic move At the time, as England and France were at war.

Although the convicts had the option to return to England, if they had done so, most would have returned to the same conditions that drive them to petty crime in the first place. Australia provided them with far better opportunities, and many of them were excellent tradesmen or even educated people who found themselves unemployed in England. These people had much to offer the developing colonies on the Australian continent, and they had the opportunity to build up real wealth and social standing.