Sentimentality was used because other political avenues were closed, and authors hoped that through it they could bring about a political change that would fulfill the egalitarian promises of the Revolution. Real political venues were unavailable, so fiction became a medium for authors to appeal to audiences for change.
Normally, anything done in the name of 'the kids' strikes me as either slightly sentimental or faintly sinister - that redolence of moral blackmail that adheres to certain charitable appeals and certain kinds of politician. (Not for nothing is baby-kissing the synonym for public insincerity.)