First they cut IT budget year over year, and then deeper mid-year cuts in the name of "productivity" - leaving people to figure out how to support systems with expired maintenance, obsolete hardware with no permitted outages, etc. When that wasn't enough, they started cutting the most tenured people - sometimes people who possessed key legacy knowledge or were solely supporting key, but unknown systems.
How could IT possibly be successful in that environment?
As for those that remain - I think it's only partly out of a sense of trying to do right by others left in the boat with them. For most, its not wanting to part with what could be a lucrative package. For some, the local job market may not be as strong as in Plano. Whatever the reason, they don't deserve disrespect.
Excellent point, @ZXeYdVe-psv.