Harm reduction actually means harm redistribution.
Those who use the term want harm redistributed to the rest of the world where they don't need to think about it. They don't like Trump because under him some of the consequences of imperialism manifest at home.
The Trump government has legitimately been significantly better for the rest of the world than any other US government. They have done incredible damage to the US empire with their incompetence.
Let us hope that the Democrats are unable to salvage it.