The speaker's initial belief in spanking children shifted when they realized the potential harm supported by scientific research. This led to a broader realization that many of their beliefs were based on presuppositions rather than critical thinking. Exposure to different perspectives and scientific data helped them reconsider their traditional values, leading to a shift away from conservative beliefs and practices. Ultimately, they abandoned the vision of traditional roles and homeschooling in favor of sending their children to a nearby school after discovering its potential as a great alternative.