In a lot of ways the song, and that whole famine, represented a new era in global fundraising of that kind. Very muh pushed by television showing images that were new to a lot of people. It became possible to think about the public being convinced to donate to these kinds of horrors that were happening very far away from them, often in countries where they didn't know much about the culture or detailed politics.
And there isn't actually anything deeply wrong with not knowing the details of the culture or politics of s county thousands of miles away on another continent. Often people in places like that have very stereotyped, television based ideas about places like the UK too. (And people in other places do get mixed up about the size and make up of other continents too, you have no idea how often Canadians get told they must be Americans.)
But there was a very steep learning curve in terms of the need to respond in a careful way to the real political situation, the perils of giving money to corrupt regimes, and so on. And actually - some of this was known by governments who had been working internationally for decades even centuries, and it accounted in some cases for their hesitation to act in these kinds of situations, or the roundabout ways they did act. But for the new NGOs that were emerging, they made a lot of errors in those early days of operating.
There was also a lot of change in the way situations were presented, the tendency back in the early 80s was to show the most horrible images and beg people to send money, and that created certain perceptions about the places where thee problems were going on. The idea was to show the worst and make people feel compelled to give. The fact is, when you say there is an ongoing civil war, and has been for decades, and corruption is responsible for a lot of the problems, people don't open their pocketbooks to the same degree. So there was something of a tendency to simplify the situation.
I actually don't think it's a great song - it reminds me a bit of Imagine, which is just really self-indulgent and naive with this idea that nice feelings will fix human nature. But in the case of DTKIC I think it's just much more simple, with a real attempt to get people to help others in need in a concrete way.