Maybe I can help clear up some misunderstandings and misconceptions for you. When one aircraft settles down on top of another one while both are on final approach to the runway, there are several things than could have been happening. In no particular order:
1. Neither pilot was doing a good job of communicating position and intentions. Neither pilot was doing a good job of listening for someone else's position and intentions. Sometimes, we get on the wrong frequency and don't realize it - we're talking to planes at another field. Sometimes, a pilot simply doesn't broadcast his position and intentions - that's legal, but dumb as all get out. Sometimes, there are distractions that disrupt a pilot's concentration - bee/wasp in the cockpit, sick passenger, unruly/disruptive passenger, mechanical or electrical malfunction, fatigue, have to pee, get-home-itus, etc.
2. If the top plane was a low winged bird, visibility downwards is severely blocked, and another aircraft can be down there and not at all visible. (That's one of the reasons it's smart to broadcast position and intentions.)
3. If the bottom aircraft was a high winged plane, visibility upwards is severely restricted. (That's one of the reasons it's smart to broadcast position and intentions.)
4. While getting ready to land, it's a very good idea to be scanning the sky for other planes that may be in using unorthodox procedures to enter into the traffic pattern. There are standard ways to enter the pattern, and we expect to see someone there. When a plane comes in from an angle where we don't expect them, it's easy to miss them altogether. (That's one of the reasons it's smart to broadcast position and intentions.)
5. Sometimes, pilots are a$$holes and try to cut into line ahead of someone else. Not legal and not smart. (That's one of the reasons it's smart to broadcast position and intentions.)
6. Other damned stuff.
Chuck, I don't know exactly what you mean by an "uncontrolled landing". If you mean without air traffic controllers to control the aircraft traffic, that would not be a good statement at all. I don't think that's what you meant, though. If you mean a precautionary or emergency landing off field, you are about 1% right. When landing off field, you still want to go in level, not straight in nose first. All general aviation aircraft have to have at least safety belts for aircrew and passengers. I have lap belts and shoulder harnesses with inertial reels, those and a fire extinguisher were the first two mods I made to the Duck. An aircraft landing level, in farm fields has every chance of people surviving. The secret is, how long it takes to slow down - how many G forces are involved. It's exactly like a car going off the road, and plowing up 200 yards of dirt coming to a stop. They're going to survive. BUT - if that car goes off the road and hits a concrete bridge abutment, survivability goes down pretty drastically.
Making an emergency (power out) landing in the dirt will likely bend aluminum, maybe give some injuries, and upset the pilot and insurance company. Better than 99% of the time, no fatalities. But, if that aircraft goes in nose first, the odds reverse.
Trees are not a good landing field. So, there will be bent aluminum. If I lose the engine, and there are no flatish or levelish fields around, and there are only trees out there, I've been told to turn into the wind, look for the softest tree, try to stall out just above it. Corn fields and wheat fields are not the best either. My landing gear is fixed, and always sticks out down there. If I have to go into a corn field, the wheels will catch on the corn/wheat/tall grass and flip me over.
In all the above situations, my shoulder harnesses will work to decrease injury, and increase survivability. Actually, though, I hope they're a total waste and never get used.
If, by "uncontrolled landing" you meant that the pilot was no longer controlling the plane, then you would be pretty correct. A basic truism in aviation is our priorities are: 1. Aviate, 2. Navigate, 3. Communicate
What that means is that our first and most important task at all times is to fly the airplane. At no time do we allow anything else to get in the way of that job. When - and only when - we can afford to divert attention from that task, we can spend time navigating. That requires answers to only three questions: A. Where am I now? B. Where do I want to be? and C. How do I get there from here? Only when we have the aircraft under control AND see no immediate dangers to handle AND have an acceptable idea of how to properly navigate, can we afford to spend time on the radio. During all this, our eyes are constantly scanning the horizon and instrument panel, we're keeping the aircraft reasonably straight and level, and we make extra sure to look cool as hell doing it.