From an employers prospective, I think it would be cost they are looking at. They have to pay a temp to do your job  or have someone take on your job that works there for the time that you are away. Production for the time would be low and a money loss, either by paying a new temp or the guy who has to do your job and his.  Employers are not threatened by you taking the time, in fact, a lot of employers know there are life issues that need to be delt with.