moral corruption, citing school lessons and social programs
The absolute bastards. The Quran and several hadith promote education, knowledge and intellectual curiosity for both sexes. Learning is the direct opposite of "morally corrupt" under Islam. It also doesn't prohibit women speaking to men, which the directive seems to claim with its censure of girls talking to a radio show host.
It certainly doesn't rule against women speaking to each other - there is debate over whether women's voices may be heard in public (!) so the patriarchs seem to have decreed that sending your voice over invisible, inaudible radio waves is 'public'.
Sadly, @bringbacktheladiesloos, I don't think they're afraid of women. All the religious restrictions on women are based on men's 'fear' of their own sexuality, supposedly. The more likely motive, however, is the othering of half the population. As they grant all men increasing power over women, they boost the men's self-esteem and unite them against a common threat 😡