The sad thing about this, and other extremist actions taken to protest the destruction of our environment is that, most often, this is the only way that these stories of the destruction of the environment even make it to the first page of the newspaper, or even in the newspaper at all. If people didn't firebomb the houses, do you think that there would have even been a news report on the subject of the bogs being destroyed?
These people that choose a method of "terrorism" to speak out do so because they are backed into a corner, or just feel that they have little other choice to get their point across. I certainly don't condone it, but the sad fact is that these "vigilantes" know that this is the only action that will really make this story newsworthy. It is what will bring their cause into the spotlight. Sure, try civil disobedience. Try non-violent protests. People have non-violent protests over environmental distruction, practically, on a daily basis. What becomes of it? Nothing - - it's not exciting news. It's not the big story.
Our media picks and chooses what news we see and hear, usually within a 30 minute time-frame, because God forbid we interrupt CSI or Survivor 85,000 with some kind of breaking news. People would riot (as they practically did in Houston a couple of weeks ago when a breaking news report cut off the last 15 minutes of CSI. So many people wrote in to complain that the broadcasting company issued a public apology and rebroadcast the entire episode).
Long story short, people don't care to hear about, do anything about, or even report about our continuous destruction of the environment. It should be at the top of the list, not too far under education, but it isn't even an issue. So.......in the long and short run, you can expect activities like this to increase, not just with the environment, though...but also with every other issue that is neglected by the media and the country.