This dump was triggered by the battle of the hashes. If we remove bch and bsv from having any value it would discourage more pointless bitcoin dilution, and prevent further hash wars.
Failure to act will cause more similar situations in the future
Competition is one big factor why crypto market is still keeping alive and kicking,these part makes other coins increases their value,so I dont believe that stop buying of such coins is the answer for the growth of bitcoin.just continue supporting and trusting so in future we will see good effect