I don't approve or disapprove of it since it's related to culture, let them decide what is best.
Just because it is related to culture, is it ok? There are lots of cultures that were banned or forbidden because it became a taboo as humanity progresses. Why not modify these cockfighting cultures so that no one have to shed blood among these fighting cocks.
There are certain things we consider as taboo or strange but might have some meaning and as I said it cold find out the superior cock and use it for breeding purpose and the same one goes for bull fighting which is more cruel because where bull and the players are put in risk but it is one of the famour sport in both spam and Mexico and it's completely legal even though government tried banning it their court overturned the ban with the reason of 'cultural heritage' which is why as an outsider I can't take any side so just the neutral stance in this matter.