For Brian May to write such a proud and powerful anthem at the time, especially based on something Dobson said, was a statement of intent - his first marriage had broken up partly due to the affair he was having with Dobson. This caused him a great deal of depression, which seemed to come out in songs like this.
Also considering this was one of the first singles off Miracle
, which was around the time Mercury revealed to his bandmates that he was suffering declining health, it has all the marks of a band coming out fighting - the accompanying music video also backs this theme up. See "Scandal
" (also on the album) for a similar feel, with lyrics more specifically targeted towards those 'against' Queen at that time - largely the mainstream media.