.
Understood, but there's another way to look at lawyers.
Let's illustrate by changing the paradigm.
Assume that a serial murder (already convicted, in prison for life) has need of immediate medical care. And the prison sends them to the local emergency room any diagnosis and/or life-saving treatment.
That emergency room physician would not be delivering his professional services based on anything related to the patient's prior crimes---only being concerned about his health.
Virtually any doctor would take that patient, wouldn't they, without any other ethical concerns than delivering the best medical outcome possible.
I agree, it's a very quirky and idiosyncratic situation for professional (e.g. lawyer, doctor, car mechanic, plumber, gardener, et al) to bump into. But, once they allow themselves to "have concerns" about the suitability of their customers, they are probably doomed to fail professionally. Because, how much due diligence is ever enough when interviewing prospective clientele?
PLUMBER
Mr. Jones, I know you just want me to fix your backed
up toilet, but before I can take you as a client I need to
know any earlier similar times you did something really shitty.
I dunno, I am just glad I'm not a lawyer needing to pay bills by representing dangerous scum bags--employing all manner of misdirection, sophistry & legal legerdemain in order to free a monster--only to have them again begin defrauding, terrorizing and/or killing more victims.