I agree with you that I don't look to Lewis for his take on geopolitics. However, I think you just have to accept that in the body politic there are many people (a majority in all likelihood) who have a say in their democracies but don't concern themselves with situations such as Israel-Palestine.
Lewis has the attention of these people, and he feels he's doing the right thing by bringing attention to the plight of innocent civilians in the region. If his post has inspired at least one person to be more aware and sympathetic to the human suffering, then hasn't it been worth the effort?
Reflecting on my first year running solely Linux (as opposed to dual-booting), I think that this culture comes from the fact that, on Linux, problems can more often than not be solved. If not solved, then at least understood. When you want to change something on Windows, or something breaks, you have far less room to maneuver.
When I was a Windows user, I'd barely ever submitted a bug report for anything, in spite of being very tech-literate. It felt hopeless, as my entire experience with the OS was that if a fix would come, it'd have to be done by someone else.
Linux treating its users like adults, produces users who are more confident and more willing to contribute.