I don't think the quality of their writing is the problem. Their "apology" comes across as the same kind of apology a child gives when their parent forces them to apologise for something, but they don't really think what they did was wrong. But hey, nobody can complain anymore because they apologised, right?
And your suggestion is that they say or do nothing until they believe all the same things you believe? Sometimes people have a real disagreement or contention.
I think there is some value to "I'm sorry that upset you" -- obviously the apologizer is not sorry that the thing was done, but they are indicating they did not mean it maliciously.
