Because they are the other side of the same coin as Republicans. Neither side wanna help us much. One side actively trying to make it worse for us while the other one is happy we are living shit but don't want it worse.
Only to the extent of the EU appetite to punish offenders. With trade problems with orange Cheeto they aren't gonna risk pissing off China. China has always operated this way since the beginning it's not going to change. They will take and take until there's nothing left to take because they know that can.