The saddest aspect of the status quo in Gaza is that we as a species have not evolved ethically. With the technological advancement, knowledge and scientific enlightenment, we are still ethically handicapped. We can still find ways to justify mass murder, find ways to accept apartheid and injustice, still classify people as "us vs. them" and then proceed to apply different standards to each.
Just try to imagine Gaza as a US city, and its inhabitants as US citizens, then ask yourself if you would find it acceptable, justifiable, or to say the least ignorable.