You may be low paid and underqualified but that does not automatically mean that you are stupid. The problem is that the work that is expected from new employees is too much for too little pay. It takes years for a new employee to become productive no matter how intelligent the new employee.
Now there is an additional challenge that new employees have to figure out things by themselves since most of the experienced high paid employees have been thrown out and cannot help the new employees figure things out.
I was a programmer analyst at ADP. Things get hectic at year end, which typically runs from Thanksgiving through about the middle of February. That time is blacked out and associates cannot take vacations then. The reason that year end is the busiest time of the year is that clients are closing out their payrolls for the year. Additional processing is done and there are frequently modifications that have to be made above and beyond the usual ones. Stuff has to balance out and if it doesn't there will be he** to pay. The ADP associates have to figure out what is wrong and fix things in a jiffy. The time windows for resolution are also much smaller during this time frame. Stress during year end is usually up through the roof even for seasoned professionals who know what they are doing.
Unfortunately, despite ADPs training programs which cannot adequately teach new employees in a short time period, ADP management has typically looked at its employees for answers to problems. This company expects employees to step up and resolve problems on their own. Management has a "We hired you for this job, so do your job. And if you can't do your job, then just what kind of a professional are you?" mentality. Unfortunately, the wages for the new associates have been dumbed down so it is questionable if the new associate should stay and try to figure out these complex issues or just leave and go to another company where the work is far easier and the pay is higher.