Haha yeah, they're insectivorous. They eat flies/worms/larvae/brine shrimp.
you can try buying some frozen foods. I always have some frozen brine shrimp around that my bettas adore. They come in little cubes and generally i can cute one of the mini-cube in half and have enough for all 4 of my bettas to have some.
Hehe as for the morals thing, some animals have to eat other animals ~shrug~ a lion doesn't do very well on a vegan diet does it? Think of bettas as little bitty fishlions(especially when they flare and have those beards).
if you can't get the frozen bugs or don't feel comfortable just try crushing the pellets or buying small ones. :) My younger VT girl cant eat/digest whole pellets so I rock a knife over them once to break them but not turn them into dust then i can just press my finger down on the bits and they stick and i can sprinkle it in her tank.
EDITED TO ADD: The peas are for when a betta is constipated. Because they can't digest them they just go right through the betta and push out whats in there, basicly.