The reason is the negativity associated with the plural suffix , which tends to be used in a derogatory way as in []{}, []{}, etc. " **Mouths to feed** " is what could sound/look like and unfortunately that is what the word used to often imply because Japan has not always been a wealthy nation like it is now.
In schools (Japanese schools. of course), I myself never officially learned to write or entirely in kanji -- **never**. I had, for that reason, long been wondering why Japanese-learners write it in kanji. However, in June of 2013, our Ministry of Education changed its mind and announced that it would use in all of its official documents.
<
I myself will probably keep writing it as or because old habits die hard, but since last June, we suddenly have every reason to write it as . Newspapers can go either way because they are not official documents issued by the government.