Personal responsibility is what you focus on when you are talking to an individual. If you are trying to make your life better, or someone you know's life better, it is great to talk about personal responsibility and making choices for your life.
But that doesn't apply when we are talking about society wide shifts in behavior. It isn't like people suddenly got genetically better or worse at taking personal responsibility. If suddenly a lot fewer people are making healthy decisions, that isn't because we just happened to birth a bunch of people who don't take personal responsibility. Something has changed. Individuals have a lot of control over their own lives, but at a society level all of those individual decisions average out, and you are left with a representation of the effect of society.
Yes people can get swept up in things and be unaware of downstream consequences of their actions, but you can also become informed and decide to change your behavior, find ways to mitigate damage, or communicate with others the damage/solution. How easy to wave your hand at the government or a corporate entity and abdicate responsibility, the parent is correct; personal accountability is faster and more effective than government regulations that also have knock on effects. My regulation example would be how cars in north america became less popular when fuel economy regulations were applied to them, but not SUVs creating the monster car epidemic we all live in.
But that doesn't apply when we are talking about society wide shifts in behavior. It isn't like people suddenly got genetically better or worse at taking personal responsibility. If suddenly a lot fewer people are making healthy decisions, that isn't because we just happened to birth a bunch of people who don't take personal responsibility. Something has changed. Individuals have a lot of control over their own lives, but at a society level all of those individual decisions average out, and you are left with a representation of the effect of society.
Systemic problems require systemic solutions.