Agree with the last line 100% - although the same argument can just as easily be applied to any and all systems in any and all arenas. The fact that the potential exists leaves a margin for error, and a window for trouble, which is what the post is about. If the potential for failure in a system is there, it needs to be addressed and the effects nullified or mitigated.

So we're supposed to just take your word for it, in the face of contradictory evidence?

I agree it's not likely, but there can be some rare cascading scenarios. Like pilots may update electronic flight bag data via an onboard network which is separate from the entertainment network...but shares bandwidth with the same satellite transciever/antenna. Your port scan hogs the bandwidth somehow, resulting in somewhat less fresh data for tarmac conditions, etc. It's not likely, but it's possible.

And it doesn't have to be a dramatic life threatening situation to incur a boatload of financial liability. See this for example: http://nypost.com/2017/08/30/unruly-passenger-ordered-to-pay...

The other reply regarding the overheated IFE is another unlikely, but possible, scenario.