 As many disabilities are not visible (for example, asthma, learning disabilities) some abusers cannot rationalize the non-physical disability with a need for understanding, support, and so on.As the prevalence of disability and the cost of supporting disability increases with medical advancement and longevity in general, this aspect of society becomes of greater political importance.How political parties treat their disabled constituents may become a measure of a political party's understanding of disability, particularly in the social model of disability.