Accessibility is very important, not just for disabled people, but its also important for able-bodied people as well!
So many accessibility tools also have use for able-bodied people, for example: the computer magnifying glass.
The computer magnifying glass was made for disabled people who are hard of seeing to see easier on a computer, but its also useful for able-bodied people in situations where maybe a webpage is displaying really small, unreadable text, and you need to zoom in to see better, and other similar situations.
Its accessibility tools like this which help everyone. Not just disabled people. That's why accessibility is so important, it's because accessibility helps every single person and not just disabled people. That's why we need accessiblity.
It's important to keep computers accessible so that everyone can use a computer easier. Especially in the day and age where computers are so ubiquitous and universal everywhere and it is a requirement for daily life.
To all software developers out there: keep accessiblity at a very high priority. All of your software should be accessible. It helps every single one of your users and not just a small portion. Please and thank you.