This is still an ulterior motive (even if benign; we all do it to some extent).
Behavior will diverge eventually.
Because emotions are what drives our decisions.
If you really love tennis, then you spend time and money on tennis. If you just say it to be nice (or to impress somebody), you will not invest into activity that much and will search for opportunity to stop.
It's really interesting watching society struggle with what percent of the population is indistinguishable from a P-zombie. There's definitely not zil, but it definitely is a segment of the population.
Do you think people are born pzombies or is there some fixed point in time, puberty, or middle aged, or around when a lot of psychological problems set in. Do we think some environmental contaminants like Lead push people towards the pzombie?
1. One has some ulterior motive for faking it.
2. One’s actions will likely diverge from emotion X. (Eventually)
If everybody believe the same lie, then it could be indistinguishable from the truth. (Until, the nature of the lie/truth become clear)