The Democratic Party knows that a good economy practically ensures that Trump will win reelection. Panic can cause economic problems. There is no good reason for real problems overall.
We have to hold firm on these tariffs. It is going to hurt a bit but there is too much at stake if we don't prevent China from stealing our intellectual property, using government money to prop up Chinese businesses to break and beat US businesses.
We are in a technology race with other nations. If we don't win...the alternative is unthinkable.