The event was organized by someone, it should be his fault because he organized the arena for the matches.
First thing to remember, organizer/s should carry much heavier blame as there's no cockfighting that may take place without them to begin with.
If there was no event like this, the people who likes cockfighting wouldn't be there.
No one will know about it if there's none who organized the fight, it's really famous around he country so if there's a noise about it gamblers will be there to gamble.
There were there to earn money, besides each place in the Philippines has different quarantine ordinance, it could be that in this area people are allowed to walk around as long as there is social distancing.
Gamblers are always aiming for the money, it's not for entertainment as there's still quarantine law that active inside the country.
Putting them all in jail will cause more damage.
They deserve it as they break the law and cause a life because of this illegal doing.