Management consultants nearly always have a conflict of interest though (i.e. the preoccupation of consultants is almost always "sell, sell, sell" rather than "help the client make money") due to the nature of their work and their short-term contact-based engagements mean they rarely have to stick around and deal with the messes that they create.
Large management consulting firms IME tend to hire (or develop maybe) people who are smart and ambitious but highly conformist and reluctant to challenge authority. Combined with nature of the work I described above (and ofc existing to make owners /partners rich), this is sort of a perfect storm for lots of "semi-unintentional" unethical behavior and sometimes fully intentional unethical behavior.
Fwiw, from what I observed this dynamic actually makes the consulting work environment terribly exploitative and miserable for non-partner consultants but consultants tend not be the personality types who would leave consulting (and the prestige/"potential to become a partner") over it --unsurprisingly, else the industry wouldn't exist as it does now.
