If they are famous, rich, or religious, that makes them easy targets.
Nothing new here, it is expected that this would happen. Comedians are having a field day. I am sure many cheating husbands that haven't been caught are laughing at Tiger too. Go figure.
But you are correct, nobody is perfect and neither are Christians but they get pounced on all of the time and nobody steps in to defend them.
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For I know the plans I have for you," declares the LORD, "plans to prosper you and not to harm you, plans to give you hope and a future. Then you will call upon me and come and pray to me, and I will listen to you. You will seek me and find me when you seek me with all your heart.