what change in the MB is attributed to karn?

i seen the dd mahabharata, and also SP mahabharat, even read a few books about karn. they make mentions of his loyalty, his generosity and valor, but they don't say any thing about him bringing about change in society.

same confusion here too

why thy talking oops thinking like tht .if dury son or dury not get kingdom .if it solely yudi kingdom thr is no chance of change or dharm wat this thinking and all .so for sake of tht so called society change karn had to marry supriya ..not vrushali ..oh god is mb spk seperate version written anywhere ;;;;;;!!!?????

is tht tym means dwapar yug men marry more women for different reasons or conditions .so y karn not marrying both same tym ..why tht stupid bw sacrifice needed ..

My humble thoughts. I must admit I do not watch SPK. But Thot its a generic Q and an attempted response.
The fact that Krishnaji supported Pandavas over Duryodhana clearly points out where Dharma lies.
And Karn was not a bad guy and do Krishnaji tried the Bheda Neeti and get him into Pandavas camp. So Krishnaji did have a good opinion of him but for his blind support to Duryodhdn and thereby adharma.

Now did Karn work for his community or for Praja- it's quite possible as he was Anga Raja and given the noble soul that he was he would have done lot for his people's welfare. His only fault is to support Duryodhana- in other words give precedence to his loyalty over that of destruction to the world due to adharma. But typically books and shows focus on Pansavas and Kauravas and do Karn's administration etc might hit have much of a mention. Now that it is a SPK show they will liberally show all good deeds done by him or as done by him given that he is the hero of the show.

In short, I would not doubt Karn doing well for his people given his own innate great qualities.