Ubiquitin,
It isn’t just in Nach. It is in Chazal and Rishonim. See for example the draconian business regulations found in Bavli Bava Metzia and the mandated support for the poor in Yerushalmi Peah that Rambam codifies as halachah. On economic matters real Judaism is to the left of Bernie Sanders. (I bet he never learned any of that at his socialist kibbutz.)
On social matters of course halachah is very conservative.