So does abortion and euthanasia, and probably plenty of other practices as well. Both of those are without doubt harm-causing practices, with their related points of controversy primarily revolving around whether the harm that is caused is worthwhile in the context of the alternative being a potentially greater harm.
Putting aside the fact that the Hippocratic oath is not actually a relevant part of modern medicine (modern doctors are accountable to comprehensive, codified sets of ethics), the fact that there is no such thing as a set of common ethics by which people choose to live their lives kinda points out the futility of this idea.
One person could say developing weapons is bad because they cause harm, another could say it’s good because they can be used to reduce harm that would have otherwise been caused. Who’s right? Neither of them. That’s just two people with different opinions. I would personally suggest that establishing moral authorities like can often be harmful, because lacking any objective truths, it’s a topic people should generally be left to make up their own minds about.
Am I right or wrong? Who’s to say? I’m just a person with an opinion, and so is anybody who would want to agree or disagree with me.