Air Disaster Avengers

How would the aviation industry (and the tourism industry) differ if there had been a campaign of killings and bombings directed against the aircraft manufacturing and airline industries? The perps are relatives of air disaster victims, who are bent on bloody revenge for the loss of their loved ones...
 
It would probably be a bad blow to the aviation industry, and would almost certainly lead to very heavy security on all flights.
 
It would probably be a bad blow to the aviation industry, and would almost certainly lead to very heavy security on all flights.
Why would they attack innocent passengers (a bit strange, given their motivation)?

I'm thinking more on the lines of "in 1975, a group of people who lost relatives on Turkish Airlines 981 launch a truck bomb attack against McDonnell Douglas HQ"...
 
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