Secondly, saying "Israel's leadership" said they want to drown Palestinians is a pretty ridiculous claim. Who said it exactly? When? Are they currently Israel's leadership?
Cause Israel is a democracy with many officials. Without something more specific, even if this is a real thing, it's like pointing to US congresspeople from the 1950s saying "segregation now, segregation tomorrow, segregation forever" and using that to "prove" that Obama is actually racist.
Whereas Iranian leadership is a dictatorship and the same people claiming they would like to kill all Israelis are the people in power now.