There is an enormous amount of evidence that harm reduction is an essential part of the response.
If I can come at this from a slightly different angle, one thing that would be helpful is to consider that we don't have to have either harm reduction or other health interventions. This is about providing wraparound care that meets people where they are. That includes harm reduction when that is what people need to keep them alive, right through to various treatment options, mental health care and supportive housing. It's the whole range of services that people really need.
I think positioning harm reduction and other interventions as opposites, not actually working together, is a false dichotomy.