There is no prohibition from the legal perspective and because there's no prohibition, it can be allowed.
The idea of "moral turpitude" — which human rights advocates and martial law victims raise — cannot easily be used.
http://cnnphilippines.com/news/2016/08/09/philippine-law-marcos-burial-legalities-libingan-ng-mga-bayani-heroes-cemetery.html
http://www.thinkingpinoy.net/2016/08/marcos-libingan-ng-mga-bayani-leni-robredo.html