warning letter! Just curious ..

last week (Monday) few of my friend been given warning letter for non compliance duty...
today few of my friend been asked to out of from the meeting room...

i was curious is this how meeting should be? by scolding them in front of people without think bout their feeling. should we just issue warning letter to them without see them personally and asking them why they cant comply the job..?
do they ever cross they mind that with continuous issuing warning letter will never help to solve the problem but will make the staff upset, give up, depress and at the end will resign?

Hmmm..is wondering..when will be my turn.!!