the Hubble space telescope was able to image the Bullet Cluster and see the results of gravitational lensing from dark matter
they did NOT necessarily see “the results of gravitational lensing from dark matter”. they saw gravitational lensing and THEORIZED that it was caused by dark matter because they have as of now, no other explanation.
Many prominent physicists have openly statied that we have no evidence whatsoever for the existence of dark matter. It’s not my idea, I don’t know anything substantial about it. All that we have is that IF dark matter does exist, that would explain away a lot of problems.