Thanks for bringing up this important subject. Yes, as we are getting used to others' pain and suffering our brain chooses to ignore it. That's why, for example, when someone gets hurt in an accident most people just pass by and do not help. However, this is also partially due to the crowd effect - "if everyone is passing by, it's OK for me to pass by also". It is noted that when someone surrounded by a crowd needs help, it can take a long time for someone to approach him, but once one person approaches, usually many more will follow. So be that first one and help! : )