English politician William Wilberforce persuasively spoke and wrote against slavery. His 400-page book A Letter on the Abolition of the Slave Trade (1806) had a huge impact. It led to the UK Parliament adopting the ‘Abolition of Slave Trade’ in 1807, and even more importantly, to the ‘Slavery Abolition Act’ of 1833 that ended all slavery in the British colonies.
Uncle Tom’s Cabin by Harriet Beecher Stone (1852) had a huge impact. It sold hundreds of thousands of copies. It has been recognised as a major factor to legitimise the American Civil War that led to the abolition of slavery in the USA (1865).
Fanatics excluded, people learn to use their power of reason. The press, radio and TV have greatly promoted access of women to all jobs, equal rights for ‘blacks’, support for refugees, the protection of wildlife, you name it.