When we bring opposite poles of two magnets together, they attract each other (or vice versa). Now, we can say that the kinetic energy gained by the magnets is due to the attractive force.
Similarly, we say in Lenz's law that if the north pole of magnet is moved towards a solenoid (for example) then the north of the magnetic field produced by the induced current will be towards the north of the magnet to oppose the change in magnetic flux.
The explanation we give for the above (2nd paragraph) phenomena is the law of conservation of energy. Now, suppose that the opposition is not offered in the above phenomena and the south of the magnetic field produced by the induced current is towards the north pole of magnet. The motion of the magnet will be enhanced in this case and the magnitude of change of magnetic flux will increase. This is said to be the violation of law of conservation of energy. My question is that why is this violation of energy? if two opposite poles of magnet can attract each other why not the south of magnetic field of induced current and north of the magnet?
I know its a complicated question but that's is the best i could do with it. I will appreciate if anyone could edit it to make it better but don't change the question.