The US wastes a few hundred million shooting down a few hundred dollars worth of missiles and drones, the us then wastes a few hundred million bombing yemeni civilians, increasing the number of houthis and encouraging monetary support to be given to the houthis.
They've been playing the US for over a decade and have learned from all the dozens of other people that have militarily beat the US how exactly to do it.
What do you think the US has been doing in yemen for the last twenty years?
There hasn't been a week in the last twenty years where US bombs haven't killed yemeni civilians.