Secondly, of course the things that matter to the citizens in different countries would be different and of course the medium of propaganda in the countries are different (as an aside IMO, WhatsApp is the more influential medium in India). The topics like gun violence, abortion rights, race discrimination, health care, taxes ...etc are definitely things that get discussed about dinner tables and hold political sway in the US. The US style of 2 party system of presidential democracy and the role of electroral college are a bit problematic but the average US citizen isn't less political aware than the average Indian.
My point being, your assertion that Indians are somehow less immune to propoganda, is potentially arising out of some unconscious bias (one or more of confirmation or conformity or affinity..etc biases)