Adult females of this species care for their young, which is fairly unusual in the insect world. Plenty of insects provision their young, but most aren’t around to feed them directly. Wasp mothers, for instance, who feed their young with paralyzed spiders die before they see their next generation. But let’s not get sentimental. Different strategies for different folks.
These beetles can sometimes swarm on your ornamentals, but they are harmless feeders on the seeds of mint family plants, so leave them alone. And for the planet’s sake, don’t spread the poisons of pesticides/insecticides: that shit harms beneficial insects and ends up in the water and, surprise, surprise, you, too.