I wouldn't excuse the directors. There are shitty people who direct just like there are shitty people in every job. If you look, there are no shortage of former VFX people posting stories of terrible directors.
In some cases, sure, but I think as a general rule that kind of insensitivity is more likely to come from management. And it could be that some of those directors are obligated to follow orders from above and would do things differently if they could.