There are accidents on the highway, planes crash, fires in buildings, etc. Let's reason about Jia Tan - a problem, not a danger to all of FOSS - not, like everything else these days, just embrace ignorant fears.
It's cool to destroy social trust, to deny it and abandon it. The counterargument is right in front of your nose - the incredible, infinite, world-changing world of FOSS. Think of all those amazing projects, social trust working over and over and over.
You're going to throw all that out over one guy? The only thing we have to fear is fear itself.