The world is silent on Rohingya because of the past historical events.

https://sg.news.yahoo.com/world-apos-awkward-silence-over-050006212.html

Only countries that don't understand the past history of Myanmar will continue to interfere and badmouth Myanmar over Rohingya.  Historical feuds are very difficult to resolve.

http://sg-stock.blogspot.sg/2017/12/the-truth-of-rohingya-and-main-culprit.html

This is the reason we don't see the world asking South Korea, China, Philippines not to mention the "comfort woman" issue again.  Instead, we see "Comfort Woman" statures being set up in these countries to remind Japan of its past atrocities.

What can we say about these ignorant countries? The famous adage "Empty vessels make the most noise" is still valid today.