More backdoors implied they already created backdoors in the first place. Currently there is no evidence they created any in the first place.
This is what we do know:
1. Google is required by law to hand over data when they get a request, such as through a NSL.
2. Google said their process for handling this request is to FTP data over to the government. The government never gets direct access to any of their systems.
3. Google publishes a transparency report on what government requests they receive.
4. Google is fighting the US government on the NSL process and suing to make that more transparent.
5. When Bush asked for all search data on all users, Google was the only search engine to refuse.
6. Google went so far as to discuss creating off-shore datacenters to place user data outside the reach of the government.
7. They're encrypting data sent from one Google data center to another to make sure the government can't attempt to intercept it in the middle. And they anonymize user data sooner.
This is the only company we've seen actively fight to protect your data from the government. So why are people creating fiction that Google is the one that is evil here, and not the US government?