circuit simulator with ought ground?

I think all spice simulators need a reference ground. It is the way they are intended. It is to make sure the circuit is referred to some point, so it is really the 0V reference. Measuring and calculating voltages at any point would always need two connections and it gets more complicated. This is the easier way. Even in the real world there are cases where it is desirable to do this, so voltages relative to the surrounding environment are defined.

Simulations are not identical with the real world. Just a helpful way to verify that something is possible and how it really works. Sometimes it needs a bit of thought to get it more like reality. One thing a spice simulator doesn't have is radiation of magnetic, electromagnetic and electric fields between wires, so the effects of this are not shown. Also stray capacitance, inductance and resistance may not be present unless intentionally added. The ratings of devices are ignored, so the user must determine whether a component is going to be damaged by excess dissipation, voltage or current.

Mostly in a circuit .....

Ground = Common = Negative for NPN device or Positive for PNP device = Return

It is the main return path in a circuit and must be needed.

It is not the same as a real Earth Ground that using in AC power source. An earth ground wire is not necessary for any DC circuit.