Why is disability often left out of discussions about equality/equity?

Why is disability often left out of discussions about equality/equity? Use examples from at least one of the readings to form your response. Your response must be at least 250 words.
Readings:
https://www.bitchmedia.org/article/free-britney-conservatorship-arrangements
https://www.bitchmedia.org/article/reimagining-americans-with-disabilities-act-anniversary

https://www.bitchmedia.org/article/netflix-crip-camp-highlights-disabled-activists-and-camp-jened

Videos for info:

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