~snip~
Have those people you spoke to registered to vote? I don't know how it is in your country, in my country you don't have to register, but in the USA you do. If you don't register in advance you can't vote on election day. Anyway, as you say, their vote doesn't seem to make any difference as they are not in a swing state, that's why I was wondering. I think in that same situation of doubt I probably wouldn't even register. Just as I think that in the main battleground states the register vote will be at an all-time high.
The thing is that if many people start thinking that their vote doesn't matter, then it actually matters.
In an ideal world, everyone would cast their vote, and the president will be elected from that.
But in the US there is a lot of people that don't vote, and there might be an incentive to do so from certain political parties.