[flangola7]

The biggest problem about dark matter:

If it is real and supposedly so common, why doesn't it exist here on Earth? What makes our world so uniquely special? Historically scientific models that treat Earth as unique in the universe always turn out to be wrong.

Hundreds of years of scientific research of all kinds crawling the planet and to date no one has been able to isolate it.

[pixl97]

I mean the neutrino wasn't physically discovered until 1970 and yet is one of the most numerous particles there is. It just might turn out that a particle that doesn't want to interact is going to be a real pain in the ass to discover.