The thing is, these other countries know what the RPF free traders absolutely refuse to admit:
The trade war has been going on for a looooonnnnng time. It's just been one-sided.
We've been stuck in a ring with the rest of the world throwing punches at us, and Trump just slid the USA a pair of boxing gloves between the ropes. Now, when America starts swinging, you can bet your sweet a** that everyone's gonna point their fingers and start screaming that we started it. But, they know that's not the case, and they can't really beat down on us too much harder than they already have been.
So . . . their only choice is to back off.