I wouldn’t blame it on the Amano shrimp. There are tons of things that can go wrong with shrimp. IMO Amano shrimp are not aggressive. They are actually one of the mellower varieties of shrimp. IF your cherries were killed by the Amano shrimp, then that probably means you were sold large ghost shrimp, not real Amano shrimp.
Amano shrimp and cherries are both super peaceful, so my guess would be a water quality issue or internal issues.
I would test your water hardness. Really hard water can kill cherries. Shrimp shed fairly regularly. Hard water often effects cherry shrimps ability to shed.
When you first add them to a tank with hard water, they can often appear fine, but if the water is hard enough to make it difficult for them to shed, the will often die off after a few weeks.
Another possibility is ammonia poisoning. I don’t know what your tank parameters are, but shrimp are really sensitive to ammonia and nitrite poisoning. The addition of the Amano shrimp may have caused and ammonia spike.
Next would be internal issues. Usually internal problems happen with shrimp from petcos, petsmarts, etc. I don’t like buying shrimp from chains stores because they always sell really inbred shrimp that will die after a couple months no matter what you do. Get your shrimp from a good LFS or private breeder.
In order to figure out what is wrong, I’d recommend posting your water perimeters (ammonia, nitrite, nitrate, KH, GH, PH etc) and what store you got the shrimp from. Also, some more details about the tank would be very helpful to figure out what is wrong (I.e type of filtration, heating, what kind of plant life you have, etc).