Google has broken their corporate ethics so many times I lost count. But that's not what's at issue here.
The employees here broke the law by destroying Google property. That's why they were fired, not specifically because of their speech (though I'm sure that motivated a more aggressive response).
I totally agree that employees should be calling them out on it, but they should do so without breaking the law. Protest on public property just outside the building. Raise awareness with fellow employees who may not be aware. Write open letters. But don't break the law, that'll just get you fired and maybe arrested.