ok, i normally couldn't be arsed getting into these types of conversations, but i'll bite.
Why, of all of the food sources in the universe, why do you reckon they chose onion bhajis speficially?
Then, if you can come up with an answer - one that does not generalise a crowd of people or their demographic (maybe it's become a renown area of south asian cuisine in the 3 months since i was last there, i dont know) - you need to ask why this specific food item and it's origin was chosen specifically for its aroma and has been put on the same level as urine.
If you have plausible answers to them to questions, then fair enough.
But there are no plausible answers, only willful ignorance.