But what I am asking lets say someone does something illegal with a proxy server from the country of Turkey, but the person who did the illegal act lives in the USA.
How would you know they live in the USA..

Also some ISP's might not be willing to help you even if their country is..

There are some ISP's that still think privacy is an issue and are willing to fight legal battles for it.
( xs4all in Netherlands is one of those )

But as MsM said it depends on how severe the illegal actions were..

Childporn for instance is delt with completely different from simple copyright infringements and script-kiddying..