Your metaphor does not hold.
As you put it, Google is inserting itself into other's business, when they should be concentrating on their own issues. In kindergarden, there are teachers and other staff to oversee the children and resolve conflicts. That does not exist here. Google has stepped up and is trying to improve their whole business environment, both in and around their area of stewardship.
When researching an issue, bug, or flaw (such as security issues in this case) sometimes you find that the system you are working on does not contain the flaw, but the environment where it is being used. Normally, we accept it as a limitation and attempt to build around the flaw, leaving it for a pitfall to others. Google is calling out such flaws and letting the stewards over those flawed systems know, and giving them 90 days to fix it before they tell everyone else.
This isn't whining, it's community responsibility, and I hope more companies follow suit.