As'salamu Alaikum dear brothers,
Welcome to the board, brother Moassis. I ask Allah Almighty to help you strengthen your faith through this board. Ameen.
I just want to add that in non-Muslim lands, the Islamic Laws (stoning to death, cutting the hand, flogging, etc...) DO NOT apply. So, if you know of anyone who has done a sin, then he/she is not obligated under the Islamic Laws in the non-Muslim countries, or even in the Muslim countries that do not apply the Islamic Law.
The application of the Islamic Laws is not to be executed upon people by mere individuals. It is for the Muslim State and Muslim Court to convict and apply.
I hope this helps, insha'Allah.
Take care,
Osama Abdallah