This can happen anywhere in the world. It is not the country but the new breed of inhumanity that is rampant everywhere. This breed does not want you to believe in humanity and wants to spread hate all over.
In my mind, that isolated and the first incident of its kind in that country had absolutely no bearing on one being safe to travel to any part of therein.
And the fact that the local media, local government & the police had absolutely bungled their work on it proved they absolutely haven't seen anything like that before and quite possibly for a long time to come.
One thing though, it's was a tragedy but a great eye opener and learning experience.
i can say that its not 100% safe. its sometimes safe but sometimes dangerous. but filipinos are often talked about for their kindness. but it can happen anywhere in the world so i can say we can still enjoy in the philippines