We use to go to Kings Canyon in CA......lots of Yellow Jackets would show up at meal time.
At first it was a bit disconcerting. Then I happened upon a 'work around'.
We just invited them to eat with us.
We would take a hotdog and cut it up into small bits, place it on a paper plate and then set it out about 20' away.
They would gather at the plate nibbling away on pieces, flying off with bits while we eat our breakfast/lunch/dinner and enjoyed watching them.
They would grab a piece of hotdog and try to lift off. If too big/heavy they would nibble it down a bit and try to lift off again---repeat until they had MAX Payload and still be able to fly away.
They enjoyed the hotdogs, we enjoyed our meals and didn't have any issues.
No need to KILL
Worked for both of us...win/win