Because they're people who are also just trying to do a job. I'm sure there are some sadists out there who take pleasure in this kind of meeting, but I'm just as sure that for every one of those, there are a hundred (or a thousand) people for whom this is the worst part of their job, who go home and hug their kids with watery eyes at the end of a day that was horrible for them.

You aren't mad at them, you're mad at the people making the decisions that are upstream of these meetings.