Is stupidity a social issue or not?

Discussing about social issue in class earlier had sort of pushed me to list down at least 10 different social issues to talk about.

Depression, anorexia, obesity, prostitution, rape... are the few of the many social issues we have in the world we live in. However, all of which are deemed "boring" for it is too common. (Seriously, what kind of world are we living in nowadays?!)

And so, I thought that 'stupidity' should be a social issue. However, it is not (according to my lecturer). But I beg to differ.

You know, common sense is so rare nowadays. Sure, there is the saying that goes that "Nobody is stupid, just that they have not fully nurtured their brains." - Perhaps it is a nice way to put it but is it a choice for one to NOT fully nurture their brains? Or is it because they are too ignorant to even bother to nurture their brains? Either way, it is still stupid of the individual; to make it a choice NOT to nurture their brains, and to be ignorant.

Take for example, teen suicide (due to bullying - physical and/or cyber). Nowadays, most teens take their lives away because of bullying. In conclusion, it is a decision which leads to a permanent act just to "solve" a temporary phase.

My opinion? It IS a stupid thing to do. Being hurt makes one angry too; and anger causes people to do stupid things.

My point is, THIS (the example above) stupidity seems to be a social issue. After all, physical and cyber bullying are both social issues. Teen suicide is another social issue. All this stupidity are summed up to be one big social issue.

As mentioned before, common sense seems to be so rare nowadays. How is that not an issue? Let alone, socially? That is where being pressured by peers soldiers on...

With the stupidity by many in this century we are all living in, is stupidity a social issue or not?