Re: Myanmar, a large part of the reason "people seem to care about" what happened in Myanmar appeared to be the role Facebook played in it. How often did you hear about it in a context that wasn't about tech and the role of social media?
Activists tend to care most when it is their government participating in inflicting the suffering.
The people taking a dump on those activists for how they "allocate" their activism not only dont care about the suffering their government participates in, they usually cheer it on.
This can be seen the most clearly in the case of the gazan genocide.
Have you considered that maybe your opinion was wrong? What would it take for the situation in Gaza to be called a genocide and why isn't it already one in your eyes?