Don't use computers for anything you want to keep private.
Perhaps you've heard of the disaster known as X?
It's pretty clear that 'security' has never been a concern for Linux desktop developers, what software would you choose to run on your open source hardware instead of linux?
Here are a plenty of exploit mitigations that simply do not exist for Linux, https://www.blackhat.com/docs/us-16/materials/us-16-Weston-W...