I myself understand the emotion that is being conveyed through the writing. Being in that place is difficult and one often loses perspective. Pointing out that his world will not end if the business goes under may help him gain perspective. On the other hand, this comment also belittles the risk and effort that the OP is taking. He has many liabilities: a mortgage, children, and bills that he is almost ignoring to not die.
I applaud his effort and wish him the best. There have been many others who have gone through tough times financially with their startups. Airbnb is one famous example who stopped developing their product in order to raise money via the cereal campaign. Risk is okay, but too much risk is likely to end poorly. Again, best of luck.
For some it's ego, for others there's a lot more on the line.
Obviously it's not as if we're risking our lives, but you don't have to put your life on the line for something to be incredibly difficult.
It read to me like they realized it's much harder then they anticipated (common) but have an attitude of doing what it takes.
Perhaps the OP can clarify :)
If it's too difficult, don't do it. If you choose to do it, don't complain. Being an entrepreneur is a privilege, not a prison sentence.
That implies an overly simplistic and (IMO) incorrect view of the human condition.
Quick simple example: complaining allows one to blow off steam which frees up the mind to focus on success.
Put another way: just because you're (perhaps temporarily) scared/unhappy/confused about what you're doing, it doesn't mean you shouldn't do it, or aren't well-suited to doing it.
Now I'm genuinely curious.
You don't have to be an entrepreneur. If you don't like the game, don't play. If you play, don't expect sympathy.