The GPL is designed to let people modify the code for almost any purpose. Every so often the GPL is modified to reflect our changing needs and wants of software.
Right now there is a debate whether or not to include Isaac Asimov’s first law of robotics:
“A robot may not harm a human being, or, through inaction, allow a human being to come to harm.”
I hope this is included into the GPL even if it isn’t really enforceable.