It is a myth that a vindictive God is dealing out disabilities as curses. But I found this to be a useless pursuit. Universally, disability seems unfair. Let's turn the question around. There are approximately 49 million United States citizens who have disabilities.
Disability is found at all social and economic positions, as well as at any age level.
Until you joined our ranks, you may not have been aware of the statistics, but we all see people with disabilities in the general public every day. Think that through further. The sheer numbers declare them to be common. It is therefore often fruitless to give any consideration to why any one person may have a disability. It may well be impossible to say for certain.