Present Perfect Progressive

Why do we use the active voice in the following sentence, even though the subject can't do the action?

I'd like to know why the following sentence is correct, even though the subject in this sentence can't do the action.

Sentence: "Homelessness has increased..."
Why can't we say, "Homelessness has been increased..."

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You can't say “increased” in the second example because you need to use the "present perfect progressive" when you add "been" to the sentence...

So you could say that,

Homelessness has increased this year.

OR

Homelessness has been increasing steadily this year.

I'm not really sure how to answer your first question though. There isn't a subject doing any action in this case. Indirectly, homeless people could be the subject but we are just speaking about the concept of being homeless.

I hope this helps. :)
Diana