Yes. Research by Hess & McAvoy (2015) demonstrates that structured political classroom discussions significantly increase student tolerance for opposing political views.
Does this improve academic outcomes?
Studies by Kuhn & Crowell (2011) show that students who practice 'dialogic argumentation' (structured debate) outperform peers in essay writing and logical reasoning assessments.
Is it safe?
According to Lynn Davies (2014), schools that avoid controversial topics risk leaving students vulnerable to unchallengeable online radicalisation. The classroom provides a 'safety valve' for vetting ideas. Silence does not make controversy disappear; it drives it underground where it cannot be challenged.