Anti-air systems are absolutely not built to handle ICBMs. The American Ground-Based Midcourse Defense, a dedicated anti-ICBM tool, is estimated to have a 50-50 success rate per counter-missile launched. They only have 44 of them. The Russian counterpart to it uses nukes to nuke the incoming nukes. Just shooting them down is not a solved problem.
Anti-air systems are absolutely not built to handle ICBMs. The American Ground-Based Midcourse Defense, a dedicated anti-ICBM tool, is estimated to have a 50-50 success rate per counter-missile launched. They only have 44 of them. The Russian counterpart to it uses nukes to nuke the incoming nukes. Just shooting them down is not a solved problem.