Punishment has to commensurate with the offense, taking lives for illegal marriage does not seem to be apt to me. The root cause is not being addressed here - the shortage of female due to foeticide on account of social disease like "dowry" are the main culprit. Unless the prevention is thought about by digging deeper into "why" and where thing went wrong, the problem will outshine the solution. The very genesis of this problem is - overall social degaradation where young people are clueless about right and wrong, where corruption, lies and illegal money are termed right at home and boasted about, the right and wrong becomes obscure to their young minds. The need is to lift overall social fiber as few knots here and there would not solve any purpose to a worn out cloth.
The khap panchayat has to take up relevant issues of far better consequence like dowry, female foeticide, Government teachers not turning up for classes, corruption at panchayat level etc. And, they seriously need PR firms to bolster their chance with media, being called Taliban will severely damage their chance even with sympathizers
Regards