While yes, a desktop can be breached (as it apparently was in this case), there's more surveillance options you have with which to secure its surroundings. And agents would have to get a warrant anyway.
If you're worried about the prospect of them warantlessly breaking in...I guess that the more likely danger is that if they are willing to resort to that, they are also willing to stage a robbery in which someone punches you in the face and makes off with the laptop. Or hire someone to spike your drink during a date.
As somebody else said: take a deep breath, take over 9000 backups, and start reducing your attack surface without falling to complete paranoia.
In fact, that's why I published this blog post. To protect myself.
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