Though I doubt it's the main driving force of the government, a common theme in news articles about suicides and murders is family members being upset that Apple won't give iPhone backups or unlock codes to loved ones. Grieving family members often portray Apple as uncaring and unwilling to unlock devices with a simple software update.

There are plenty of people with good intentions calling for backdoors like this. I believe a good government will know the implications and ignore the pleas, but it seems there aren't that many good governments left.