OK lets see you try that with a 747 at 300ft on final approach - after all you are only
asking a pilot to climb and turn (the basics of flying a cct)
Climbing and turning in approach configuration with full drag flap and low speed at low height is not something that is part of flying a normal circuit. Have you ever tried it - if not I suggest you ask an instructor to take you up and demonstrate - but do it starting off at a safe height.
However, executing a go-around by applying full power, controlling the pitch up (in a 152) removing drag flap, stabilising the climb attitude and trimming off the resultant stick forces, accelerating to safe speed to clean up remaining flaps, whilst flying over a cleared area (ie the aerodrome and climbout lane)
is the basis of normal circuit flying. Now try adding a turn into this and it is easy to see how the situation can quickly become unsafe.