The point is very serious, IF you can comprehend it:
As long as Iran keeps vowing "Death to America!" do you think it will help the American people be more or less sympathetic to what Iran wants USA to do and stop supporting Israel?
All it does is help Israel convince the American people that it is their friend who stands between those shouting "Death to USA!" and the people here, and forces USA to do everything it can to prevent Iran from exercising its rights as a sovereign nation to get nuclear technology.
Is that too hard for you to understand?
THAT IS MY POINT, LIKE IT OR NOT. At least THINK ABOUT IT!