Because a fork approximately divides the value of the currency between the two parts.
Imagine the USD was suddenly split into two incompatible and free-floating currencies, with the US House of Representatives saying one currency is the official one and the US Senate claiming the other. It would be chaos.
Imagine the USD was suddenly split into two incompatible and free-floating currencies, with the US House of Representatives saying one currency is the official one and the US Senate claiming the other. It would be chaos.