I did read the article.   I have also read some postings from environmental nut jobs on how they could do to oil and gas workers what they did to loggers back in the day.   Back then they 'spiked' tree trunks in ways that could cause injury or death to loggers cutting down trees.   A little tampering with equipment on an oil well could cause a fire or explosion and kill oil and gas workers.   The anti oil and gas activists have done everything else to try and stop this legal activity from occurring so taking it a step further wouldn't surprise me either.   You certainly can't say the environmental nuts you've supported in posts haven't advocated violence.