One among those security people may hold an umbrella when needed. Some people may not like this. Such people will carry their own umbrellas. PM Modi is known for his modest behaviour and never like to show his power, I feel. That is the reason he might have not allowed somebody else to hold umberella from you.
I think this system was introduced when Britishers were ruling our country. We used to see a servant with a cross belt and he used to do all such works for the government officers. We should come out of such a practice. All are human beings only at the end of the day.
K Mohan @ Moga
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease