This is a common thing happens in different countries where the government mandatory give assistance to there citizens with disability, and the sad truth is that the assistance from government is not enough.
This is the perfect time to introduce bitcoin to persons with disability by doing this they don't need to rely only on government assistance, because they are now started to earn there own money to support their needs.
I think this depends on the disability of the person. If the person has physical disability, then he can still do bitcoin. But if he or she has intellectual disability, he may find it difficult to follow the steps. Having a disability is not a burden to the government, they only need assistance as you said.