Why do I have fly over the runway first before landing?

Trying to fly a straight in approach, when others are flying in the pattern, is highly dangerous.

There have been quite a few accidents/collision, when pilots have tried to fly straight in… so it is NOT the recommenced way to fly into an airport, unless you are being told to do so by ATC who should have radar (or the Tower, who may well have radar, or a slaved radar display from a nearby radar facility)

Classic example of what can go wrong …

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