No, but the ideal is lost!
I think Cap's death had nothing to do with anything going on in America today, if it was there are much more impactful and less vague ways to express feelings than simply having Cap killed off.
As for the America ideal, we haven't had it for about 5 years now. America doesn't work with it's allies, we have abandoned diplomacy, and guaranteed freedoms have been trampled on by the current administration.
This is the same administration that squandered the world's goodwill after 9/11, the same administration has lied to its people for 5+ years and ignored the wishes of those it was elected to lead. This is also the administration that has seen countless criminal investigations of republicans under them, and is suspected of leaking names of their own agents for the most pety of political reasons (her husband disagreed about WMD's).
Cap's death had nothing to do with that IMO.