It’s not genetics, the partition generation was tougher physically, spiritually, and mentally than the ones being born in Delhi. Also, let’s not forget how Sahibzade and Guru Sahib’s genetically are khatris along with men like Hari Singh Nalwa.
The current generation is even weaker than the the ones who had to deal with 1984, (back then there were at least a few with a warrior spirit, but now there’s much less).