Because they are a menace to the area and will use their nukes when they get them..
Trump is making sure they don’t get them without starting a war.
They are more than an area menace - they are a global menace - and when they have the means will nuke Israel, Rome and NYC because they need a lot of blood to fulfill their dream of bringing the 12the Imam out of the well he climbed into in the early 7th century. This miracle worker will unit all the wold under the Islamic banner and when that is done he will bring every one to Paradise with the last two living humans obliged to kill each other.
Fun guy. Fun country.