Why does increasing Kaspa's block rate affect network security?

In traditional blockchains, raising throughput by increasing the block rate or block size inevitably raises the orphan rate — the share of blocks that get discarded — which in turn lowers the proof-of-work security of the network. The orphan rate matters because orphaned blocks represent wasted work that does not contribute to the chain's defenses. A higher orphan rate means an attacker needs proportionally less hash power to threaten the network, because more of the honest miners' work is being thrown away. This is the core tension Kaspa is designed to resolve: you cannot simply speed up a traditional blockchain without quietly making it easier to attack.