I might buy the argument that they are more accurate since they are launching from a fixed position and can navigate without GPS if necessary. But there's no way they are less vulnerable to a first-strike scenario than our subs. The location of those silos is not a secret, and even before hypersonic missile technology came along it was a race to get those missiles out of the ground in less than the 30 minutes it took for the first-strike ICBMs to destroy them. By the time word gets to the President of incoming missiles, he gets confirmation, orders the ICBMs launched, and the launch orders make it back to the silos, the incoming missiles are only minutes away from target. Not much time for things to go wrong.I think they are still considered more accurate than other missiles, despite missiles than can course-correct mid-flight. Plus, course-correcting missiles rely on gps. Ground-based ICBMs do not from what I understand.
Either way, they are certainly less vulnerable than sub- or air-launched.
Same with the bombers on the ground.
But the subs? No way they could be taken out in a first strike. They are this country's most secure strategic asset.