When Americans are killed by the Israeli army, why don't Fox news and CNN say anything about it?

In the last decade, several American and other western peace activists were fatally injured and killed by the Israeli army. A few of the names are Rachel corrie, Furkan Dogan, Tom Hurndall, Tristan Anderson, Caoimhe Butterly. Rachel corrie was crushed to death by an Israeli bulldozer on March 16, 2003. She was protesting the demolition of a Palestinian home. Her parents asked for help from the U.S. government to investigate her death again and again. The government refused to help them every time. My question is, when an American is killed by the israeli army, why isn't there any attempt to seek justice? And why don't Fox news and CNN say anything about it like it does about the three hikers captured by Iran?