It's also Rose of Leary like [0]. The theory is that being helpful to someone who is (ie) competitive or offensive will force them into other, more cooperative, behaviours (among others).

Once you see this pattern applied by someone it makes a lot of sense. Imho it requires some decoupling, emotional control, sometimes just "acting", but good acting, it must appear (or better yet, be) sincere to the other party.

[0] https://www.toolshero.com/communication-methods/rose-of-lear...