JMM99 asked:
1. Should "anyone" be doing "something" about the CAR; and, if so,

2. Who is that "anyone" who should be doing "something"; and what is that "something" ?
Yes, the "anyone" should be African only, maybe with non-African financial, logistic and other support. If Africa thinks it is a problem for them, a moot question, there are some who have the means.

The "something" is to restrain the 'men of violence' who currently are on a looting plus spree. The first step in 'peacemaking' and some form of settlement, even if that means one day partition - South Sudan took a long time to get independence.

Easy from a faraway armchair.