You have to be careful with that line of reasoning; I could rephrase it as "Why bother worrying about minorities?"
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People with disabilities cannot be treated like legacy browsers. They have no other option, and there are times when viewing the content is mandatory. Consider content for school, medical, financial, governmental; in those cases we have a responsibility to create an equal experience in both law (WCAG 2.2 compliance, ticking boxes) and spirit (ensuring they can access the information needed to live their life).