Please, stop jumping to conclusions. This doesn't seem to be because of the Argentine government, as Chile has also been removed from Google Play.

(Spanish) http://faqsandroid.com/google-retira-a-chile-y-mas-paises-de...

(English) http://translate.google.com.ar/translate?sl=es&tl=en&...

So, now it seems that is Google who has to explain the reasons of this move. If I had to guess, I would say that those countries didn't represent a big market for them to support. But we won't know the reason behind this until Google reports one.