What do all these の's do in this sentence?


> 病人を気遣って何が悪いののさ

is the sentence a friend sent me. The meaning is

> "What's wrong with worrying about a sick person?".

However, what do the trailing の's do and what is さ doing here? My professor
explained it briefly as being similar to ですよ but I don't understand why it is
being used here.

My only guess is that the first の is being used like it would be in this
example sentence:

> 赤いセータと青いのを買った = I bought a red sweater and a blue one.

and that the second one is being used as a question marker turning the さ into
a colloquial form of ですか




First of all, the sentence:

> 「病人{びょうにん}を気遣{きづか}って何{なに}が悪{わる}い **のの** さ。」

makes little sense as is because of the 「のの」 part. As has been stated by
others, that should be a single 「の」 instead.

Second of all, your professor's comment makes no sense if I may be honest.
That is if s/he is saying that 「ののさ」 or 「のさ」 means 「ですよ」.

The 「の」 in 「悪いのさ」 is a particle expressing affirmation/declaration.

The sentence-ending particle 「さ」, when used in conjunction with an
interrogative (in this case, 「何」), expresses a light kind of **_refutation_**.

> "What the heck's wrong with worrying about a sick person?"

By now, it should be clear (if I did an OK job here) that the 「の」 has
absolutely nothing to do with the 「の」 in 「赤{あか}いセータと青{あお}いのを買{か}った 。」. The 「の」
in that sentence is a nominalizer. "a blue **_one_** ".




First of all, the sentence:

> 「病人{びょうにん}を気遣{きづか}って何{なに}が悪{わる}い **のの** さ。」

makes little sense as is because of the 「のの」 part. As has been stated by
others, that should be a single 「の」 instead.

Second of all, your professor's comment makes no sense if I may be honest.
That is if s/he is saying that 「ののさ」 or 「のさ」 means 「ですよ」.

The 「の」 in 「悪いのさ」 is a particle expressing affirmation/declaration.

The sentence-ending particle 「さ」, when used in conjunction with an
interrogative (in this case, 「何」), expresses a light kind of **_refutation_**.

> "What the heck's wrong with worrying about a sick person?"

By now, it should be clear (if I did an OK job here) that the 「の」 has
absolutely nothing to do with the 「の」 in 「赤{あか}いセータと青{あお}いのを買{か}った 。」. The 「の」
in that sentence is a nominalizer. "a blue **_one_** ".

