Why do Marx and Lenin disregard the lumpenproletariat?

I have not read every document the two wrote regarding the subject, so I may be misunderstanding; but the ProleWiki makes it sound like Marx and Lenin--and therefore Marxist-Leninists would--disregard the revolutionary potential of the lumpenproletariat. It seems like sex workers and homeless folks and disabled people are all spat on by the bourgeoisie and would be glad to help take them down? I'm disabled and mostly unable to work (I do work a little, but not even enough to be part-time) and I consider myself an ML.

The wiki describes the lumpen as exploitable by reactionary and counter-revolutionary forces, but we've seen in the West that the proletariat as a whole is susceptible to these forces. See Zohran run one of the most radical campaigns we've seen in a while and then put on Zionist officials and advocate for changing the system from the inside. The working class is content to sit down and wait for someone else to make change for them. Most disabled people I know, on the other hand, are ready to tear the system down with their own hands. So are we supposed to just gloss over a group of people who've been pressure cooking this whole time? If so, why?