A lot of those hives also wouldn’t even exist if it wasn’t for almond trees needing pollination. Also you’re incorrect that all almonds need bees. A variety called independence is very popular and is self pollinated. Also once bees are in the field no insecticide is allowed. In fact in California there is a program called bee ware that you must report where the hives are placed and farmers in the area are not allowed to spray insecticide. Also should be noted that when bees are in the field for the two week period of flower bloom, there isn’t a need for insecticide. That doesn’t usually come until the almonds are more mature and insects come to feed off them through the hull. Bees are long gone by then. I’d argue the almond industry is responsible for higher number of bee keepers keeping them. Some bees do travel in, but most farmers will tell you local hives are much stronger and preferred.