No. Just because "it can be worse" doesn't mean someone doesn't have the right to be unhappy. It's a totally specious argument. "Your kid died? Well, what if BOTH your kids died? You have a lack of perspective..."
Yes, they would no doubt prefer their high-paying job over a minimum wage job. But that doesn't mean that they no longer have any right to be unhappy with their lives. This is exactly the point of the hedonic treadmill[1]. There are happy people with rough jobs and unhappy people with great jobs.
[1]The hedonic treadmill, also known as hedonic adaptation, is the observed tendency of humans to quickly return to a relatively stable level of happiness despite major positive or negative events or life changes.
