Agree with other posters that since his family were in California at the time there are no concerns about frightening the children / indtuding on domesticity.
Perhaps if he just had the one home the protest might have seemed frighteningly intimate, but when you have four or five you probs aren't so emotionally invetsted in each one.
Also, I'm pretty certain that Greenpeace will have approached this with all the health & safety protocols and expertise of an upmarket construction firm.
Crap home security though!