It is difficult to let the bad trades go. Like you said, human nature.
I did break my rules by keeping it overnight. However, what reinforced my decision was that my indicators were showing that a correction was coming , which did take place. ES went down 5 points at the open which was enough to get out of my position and get a small profit.
I do see a valid point in stating that the sim should be completed exactly as if it were a live trading. However, in order to be ready for live trading one has to first correct the mistakes on the sim.
My time is slowly coming. I am going live as of the next week. Apparently when the money to fund the account comes from a joint account, spouse's signature on one of the forms is needed to complete the whole transfer. I did not know and had to rectify the problem which took time. Moreover, this week is rather busy for me, three out of the five trading days will be occupied tending to other matters. So, it seems that April 23 is the date of departure.