The cooling fan is there for a reason, simple as that. Don't worry about there being a few lights in front of the grill, there's more than ample room for the fan to suck air through, and more than ample room for air to flow through.
Thermostats are in place for a reason, and that is to regulate the temperature of the cooling system and engine, and to allow the engine to heat up quicker to allow it to operate more efficiently more quickly. Too hot, thermostat opens up and allows cooler water to flow through. Too cold, thermostat closes to allow things to heat up to the correct temperature. A very simple device with a very simple function.
Most vehicles run cold without a thermostat. Think about it (you too Siva). If your cooling systems are just barely
ample enough, what would happen to our friends in hotter climates? Reasoning says that the cooling system would not be capable of cooling the engine down to a safe operating temperature. Thus, the over-engineering bit comes into play. Our systems are very
efficient at cooling our engines down. So much so that without a thermostat in place, our engines run too cold. And it's not just Jeeps,
it's a variety of vehicles from a variety of manufacturers. My brothers Supra, for example. 2.8L I6 engine. That engine gets very hot, very quickly. Without the thermostat, it runs ice cold all day long.
With the thermostat it heats up to operating temperature within minutes just idling away. My 2.5L Jeep is the same, as is a buddies 5.2L GC, so it's not just one or two engines.
I understand how our cooling systems work very well, not only from first hand experience, but from classroom experience as well. So I may not be the brightest bulb in the bucket, but at least I have schooling and physical experience on the subject matter