It goes mach 20-24, can deploy multiple warheads and fake warheads which makes defense against them pretty much impossible.

Israel doesn't need ICBMs to reach targets in Iran. They could use MRBMs and cruise missiles which they already have.

Finally Iran can only slightly damage buildings with their random attacks so damaging anything for real is practically like asking an ant to crush an elephant.

It's not always necessary to obliterate a target to cause considerable impact, and Iran's attacks certainly aren't random. Just look at Qatar and their helium production.