[johngalt]

Do you honestly think if you get lost and knock on a strangers door you'll just be indiscriminately killed in the USA?

Remember that the statistics are all talking about relatively small numbers. Take USA's 0.00004 vs Australia's 0.00001 it's technically correct to say '300% more likely', but it's still a very small chance.

tl;dr Your more likely to commit suicide than be murdered in either country.