The problem with a generator is it's a short term solution. Gensets are expensive to run, regardless of the fuel used. I'd be more worries about running out of fuel than the neighbors massing at my front door with torches and pitchforks demanding I share my frozen tater tots.The problem with a generator when the SHTF and the power goes out, is that people can hear it. They see that your house is the only one with the lights on... Makes it pretty obvious who has a working freezer and food, people will see it and come looking...
And I know that some will have their battle plans drawn up and their property equipped with sniper nests and traps they learned in The Nam... But I highly doubt that most of the people saying that, are really prepared to slaughter their neighbors that are just trying to feed their kids...
I listen to people talk about these things, and its kind of a morbid version of the "what would you do if you won the mega millions" discussion, where you fantasize and plan out all the things you would do, knowing that it's all academic and almost certain to never happen anyway...
It's amusing, and in some ways alarming, listening to people talk about how they have all their plans for the various ways they would kill people who are just trying to survive... You wonder if a few of them aren't walking the line between sanity or insanity, almost wanting such times to come...