You guys are psychopathic. They were kidnapped in Gush Etzion, there are 70,000 Jews who live there.
How can anyone blame them or their parents for their death because they were in such a place?
actually i think most people, excluding yourself obviously, are aware that its more dangerous living in the settlements. the settlers themselves know that as well. they feel justified putting themselves and their families in that danger based on their beliefs.
if someone holds their beliefs are mistaken, then yes, it follows that the parents definitely do bear some of the responsibility for anything that happens. its pretty simple.
now, whether or not these things should be spoken out in a public setting during shivah... thats a different discussion.