They hoped that their pure intentions were proof enough that they were not evil, that they were not what was once Grogar the 'Father of monsters', that they were not blasphemous sorcerers that were up to no good using the demons for their gain, that most of them were good... But it was not good enough, even when they offer their help to manage the demons to the ponys, even when they were not straking back when they started to get killed, even when they decided to exile themself so ponys may live in peace, it was never good enough.

This this sounds like a good way to go extinct. Sometimes you need to give people the back. Hoof.

This might be a hot take but from my overall knowledge of the situation so far you can't really blame the ponies. From what I've seen, there's been many fractures in the history between hunger the ponies and Celestia. Plus there is an unknown. A mixture of celestia's paranoia in hunger's paranoia has basically been mixed together to make a stupid soup.