There are alot of assumptions in your post and it makes me and i presume many others, wonder about your life experience to have such pronouncements.
Divorced/widowed people aren’t “diseased” that they need to be confined to only “their own kind”. You think you’re saying this from a social justice POV but on a personal level it doesn’t matter that much. What matters is if the two people have some sort of compatibility and the families generally get along.
You may find this hard to believe but compatibility can happen between a divorcee and someone who’s never been married (let’s call them “single” for sake of argument). They too go on to have happy marriages.
Being divorced/widowed/single/physically challenged, doesn’t matter. In your physical challenged example, you won’t be doing anyone else a favor by rejecting someone who likes you, least of all anyone in society. No one will run up to you and give you a hug and say thank you for not marrying their spouse.
Also, not everyone goes out specifically seeking someone who’s been divorced/never been married. Sometimes you meet someone and an interest develops.
Plus, if you believe in Islam, there’s no sin or anything wrong in marrying a widow/divorcee. Divorce isn’t haram. Also, rishtas are a matter of kismet, so someone may be fated to marry someone who was also divorced.
Divorced people marrying single people will not bring destruction to society like you think it will. On the other hand, the thinking of “stick to their own kind” and “divorced girls are not good enough for single men” like yours…has already done that.