What do you mean with 'why do you stand by'? With all due respect, it's easy for you to say from the comforts of living in a western country.
There've been armed struggles against the government for decades throughout the country, in pretty much most regions, which has lead to no meaningful changes to date.
Ethiopia has become more ruthless recently in targeting anyone who stands in their way, in their quest to crush armed rebels. With no consideration to civilian lives or infrastructure. The recent war in Tigray should give you a hint to what could happen. And they were more powerful than we could ever be.