This is no way disregards the difficulty of living with an actually severe case of ADHD but is not what most of these people are dealing with.
EDIT: many seem to have misunderstood what I mean by this. I'm not saying these people are only claiming to have ADHD to use it as an excuse. What I mean, is that they may very well do have, and they're using it as an excuse. Mostly to themselves.
While I do agree (or at least hope) that we all have the agency to positively influence our own lives and those around us, the main point there in my opinion is that different people have different resources in life.
Someone that's experienced systemic racism, or someone who's brain is a wee bit non-standard just has it harder than someone not experiencing these issues.