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
But doesn't BSV and BCH remove the pressure off bitcoin?? Remember these altcoins were born from bitcoins problems which were coupled with high transaction fees and long waiting times for TXs to confirm.