The difference is that this song is railing against the crimes committed by juvenile delinquents, who have actually done something to deserve the flogging that's being recommended by Invader. In the second version they have committed racially motivated violence against West Indian immigrants. The difference between them and the slaves is that slaves were (and are) sometimes being racially oppressed and don't have a choice in committing violence against their owners as it's often their easily way to express themselves overtly. The Teddy Boys did have a choice about whether or not they commit these attacks. One is significantly being oppressed while the other group isn't. If I (a Chinese-Australian girl) witness a riot against Chinese immigrants from Southeast Asia in Australia and write a calypso about how the white rioters should be punished in the harshest way possible, I consider myself to be expressing my opinion of racial tensions, especially if they involve beatings and other forms of assault.