There are few things at play. First there is mounting evidence that working more than 40 hours makes you less productive [1]. So you're not helping and probably hurting things working beyond that. Second, there is a very real revulsion at working on the weekends, especially if there no time shift like working Tues-Sat. Combined this type of effort doesn't scale, which leads to point three. Third, management has a tendency to death march permanently. Since everything requires so many hours, no one has time to stop, reflect and improve processes to reduce that type of effort.

Taken together, many people with a problem solving mind see those involved as wallowing in their own failure. A natural response to such behavior is revulsion.

1 - http://lifehacker.com/working-over-40-hours-a-week-makes-you...