First of all, I think governments have tried to find him but couldnt or may be found and never revealed. I may be wrong but if governments tried to find someone then they will. Even if they have found and have hold on him, I dont think he will do anything against his will.
why the heck would they find satoshi nakamoto ? for what ? just because they hate his invention ? i wont believe that governments are concerned about satoshi because they dont even get concerned of bitcoin . although it is true that when govt's find someone like for example criminal , they dont usually reveal it on public because the life of the convicted will be threatened but on some cases they can reveal it in public , idk but i think depending on how severe the damage have dealt .