Do you think people with a gambling addiction are enjoying it and making an informed choice to continue, and could therefore just choose not to do it instead?

Sure. Also blaming individual for consequences for societal constructe they fall into is typical of those who lake any sense of social responsibility.

I hope you can see how this kind of argument on themselves don't make anyone extend their perspective if no one challenge its own preconceptions.

There is no such thing as society.

There is no such thing as individual, only a collection of cells. And no such thing as cells, just a bunch of atoms...

No one thinks of the quarks anymore - what with all this collectivism

You have far less control over things than you may think.

Sure, some of them do that.

But seriously, mental illness exists. Other sorts of things affect the brain - hormones, cancers, dementia, injuries, etc. Some things really are completely out of your control and no amount of "personal responsibility" is gonna get you out of them nor avoid them.