IMHO, we seek models explaining certain observed cosmological behavior. As long as plausible models for dark matter range from WIMPs to primordial black holes o

IMHO, we seek models explaining certain observed cosmological behavior. As long as plausible models for dark matter range from WIMPs to primordial black holes or axions and what not, I consider it unreasonable to claim that we know what dark matter is, and all it’s properties. Eg: if all dark matter experiments (direct and indirect detection) returned null results over the next several decades, then dark matter would still be an open puzzle. With regards to “we”, I think it applies equally well to any group as small as physicists working on DM, to all scientists, or everyone discussing the subject. I expect most particle/astro physicists I’ve interacted with to find those statements very reasonable.