system
Given the following post, respond as if you're commenting on Reddit:
human
[general space navy combat] Why do we never see FTL propulsion used with kinetic weapons?

Couldn't a few grains of sand at warp speed destroy an entire fleet or planet? If we can move dreadnoughts and capital ships at these speeds, then there must me an insane amount of kinetic energy that is produced, and would make an unbelievably powerful weapon.
gpt
If a ship moving at warp speed really carries such an enormous amount of energy, then it must require enormous amounts of energy to accelerate to warp speed. So... why not just cut out the middleman and direct your power source into a laser cannon or a bomb or some such? The warp drive isn't a necessary part of this weapon.

But there's no reason to think that things moving at warp speed have large kinetic energy. Sure, under normal circumstances the faster you're moving then the more energy you have. But no matter how much raw kinetic energy you pump into your ship, it will never reach (let alone surpass) the speed of light. Warp drives have to be based on completely different physics than ordinary rocket engines. They may not require large amounts of kinetic energy to go fast.