Kaiju in fiction are usually alien in nature or are created by aliens. However, in my story Kaiju seems to be less effective as an apocalypse compared to diseases, asteroids, black holes, and many more apocalyptic threats. In my story aliens decide to use Kaiju to attack/destroy humanity. I know this is a broad question so to summarise why would aliens use kaiju to attack humanity instead of much more effective weapons?

• Kaiju are usually around 1 kilometer tall with some sort of directed energy breath attack.
• The aliens are similar to humanity in terms of society and personality but in terms of technology are hyper advanced.
• Earth is at the same technological level as they are now with countries possessing the same geopolitical standings.