It is the same question if junkie is responsible or his dealer. Or soldier that is killing or his government going into war. Or teenager who was abused and is abusing someone.
The OP question does not make a lot of sense. Everyone is partially responsible for the **** we live in. And everyone will feel the consequences.
For me the important question is: what can be done. And I really do not think that much can be done. The excuses for responsible gaming are just ridiculous. It is obvious that those notes are here just for politicians to have excuse for voters who pretend that trust to politicians. And those "responsible gaming" excuses are here also for casinos and affiliates to allow them to sleep a bit better on the bloody money. And it is part of the marketing as well.
We are all bloodsucking ticks, hungry, devious
each one latched on to the ass of the previous
when the last and the first latch on it can be shown
ass-blood sucked by the first from the last is his own