The argument could be made that non-zero numbers of people currently choose courses of study that very rarely lead to employment in that field. In such a context, is it unreasonable to consider that perhaps this might continue to occur in an environment where tertiary education is free?

You may also wish to consider dialing back the vehemence of your rhetoric. Accusing people of adopting "kill the poor" rhetoric in response to relatively polite disagreement may potentially be seen as a somewhat less that reasonable reaction.