First of all, you didn't know that obvious that when a satellite gets into orbit decay and started reentry, the trajectory isn't as "可以计算的" as if it is a satellite in orbit, which you made the comparison. Secondly, China ASAT was not 单发一击而中.

All target acquisitions require 捕捉、跟踪,计算的, saying things like this is no more stating "你妈妈是女人。" However, common sense is not enough. No one can rely on your "common sense" to shoot down a satellite.