It sounds like you don't understand software. Fundamentally, software ALWAYS has bugs. Just like everything else in the world. It's high profit / low risk to find software bugs and exploit them.
I can enter your house just by using a rock I find in your garden right outside your door. But using the rock to smash your window, enter, and rob your stuff is low profit / high risk. It happens, but not as often as it could.
But it's VERY costly to find ALL bugs and fix them. It's not like I can look through software code and go 'Gee - there's a bug - I'll fix it'. It's highly complicated and takes a lot of brain power to figure out.
If you have your house burgled then it's totally different, you know it's being burgled when your present, and no window manufacturer has an obligation to come and fit bullet proof unbreakable windows if someone does smash them in with a rock. You chose a very poor analogy.
A software house is obliged to release software that the general public will believe to be secure to ensure it is secure at release.
We are not talking about some small 5 member team here, we are talking about Microsoft and Apple with billions in funds and massive employee resources and endless other resources. They have years and years and years of experience.
So if they lack the brains, or cannot afford, to find their security holes themselves then perhaps they should not be making software at all, because Google seems to have much better resources and even more money to do the work for them.
That is what you are implying, that Google has more 'brain power' and money than Apple or Microsoft combined, considering Google are finding the holes in both the other company's software.
Goolge are more capable at finding software security holes in Microsoft and Apple software products, then either Microsoft and Apple are.
No, Google are highlighting how the other two neglect to fix their holes most likely for profit increases. And I think Google has been much more then generous to allow so much time for the holes to be patched. And I would question that without Google performing this service just how quick these holes would be patched, if ever.
Perhaps Google should fix the holes themselves too? They will probably be better at that also.