Re: “ISIS has nothing to do with Islam”.
but I will respond nevertheless. There are US leaders who have condemned Israel. However, your example is flawed since Isarel’s actions were not due to the US. Israel is a sovereign country, and took whatever actions it deemed necessary to protect itself and send a message to the Palestinians. You may disagree with their actions, but they did not do it in the name of USA.
As to your other question, the OP had asked how Muslims can prove that ISIS = Islam hence the discussion. You don’t want to condemn ISIS or terrorism, thats your choice.