In the spirit of your original question:

The very reason Christ was sent to earth was to atone for Adam's fall. We ALL fall short of the perfection of God. We Christian's (some at least) act in this way in the same way that members of other religions fall short of their perfection. If is not an excuse, only a reality.

Should I defame all Muslims for the actions I see on the television in India or Palistine, OR should I listen to the KKK and take their view of Jews? Rarely do you hear the stories of saints who live Christ's example. How often do we hear of a saintly Jew, Muslim, Hindu or humanist. It is not that do do not exisit, it is that they are not news worthy.

I was recently at in Washington DC for the swearing in of the president. I saw hundreds of environmentalists drop their posters on the ground after the President passed and walk away from the litter pile. Should I believe that all enviromentalists are bad, or that some of the most vocal ones are simply human in their inperfection? If a Christain calls for a sniper while protesting abortion, then they are wrong. That does not make all Christians wrong.