That statement is true,
By examining the sales person's facial expression you could spot which words that come out from their voice are sincere.
If the sincerity is spotted when the salesperson is asking for the problem that you have and the solution that they give, they might genuinely believes that their product might help you.
Because there were to many convicts in jail so it caused overcrowding. America wouldn't take any more so they thought Australia would be suitable because of its isolation from the world.