They have electron microscope photography of SARS COV 2 and other viruses. There is actual electron film footage of viruses injecting themselves into cells.

For decades and decades they could detect black holes, and found evidence of their existence but did not have a pic up until a couple of years ago. Similar with viruses.

Viruses are a huge part of the cycle of life in every kingdom and genus of living thing.

If they didn't exist the entire cycle of life would collapse. They are one of the number one killers of bacteria which produce all sorts of antiviral compounds as a result.

Someone offered a million dollar reward if someone could isolate the virus according to Koch's postulates which has not been done so people hear that and think of t hadn't been proven to exist.

It has been proven to exist but not by Koch's postulates because that is for bacteria, not a virus. You can't grow a virus on agar in a petri dish and according to Koch's postulates includes doing that, and then infecting a human which would likely be against the law.