These are product updates and often times contain security and stability fixes, nobody is trying to trick you here. Apple is proactively trying to keep their users up to date, I see no problems with this.
Edit: Take a look at how any Stable/LTS Linux disto handles this. If a bunch of hackers can do it on such a diverse software stack, surely the company with the largest cash reserves in the world can figure out how to do it on a software/hardware stack they control completely.