"the crash was generally believed to have been caused by faulty wiring in the cockpit after the entertainment system in the plane started to overheat"

It's not too far fetched to think you could end up with an infinite loop (or other random issue) in some inflight entertainment system code, causing it to overhead and potentially ignite. I'm sure there are plenty of safeguards, but they too could fail...and this is why we still have circuit breakers and a master switch in planes that a human can control. Sadly humans too can (and often do...) fail to make the right decision.

Any system other than flight surfaces, avionics and the source of propulsion to an aircraft add some degree of risk that we could otherwise fly without.

Edits: Spelling and general sillyness.