Don't be stupid. This was England in the c.19th. Darwin was a contemporary of Charles Dickens! Nobody had been burnt at the stake for over 200 years by then. In any case, the notion that he delayed publication seems to be a modern myth. I quote the Wiki article:- "Darwin had his basic theory of natural selection "by which to work" by December 1838, yet almost twenty years later, in June 1858, Darwin was still not ready to publish his theory. It was long thought that Darwin avoided or delayed making his ideas public for personal reasons. Reasons suggested have included fear of religious persecution or social disgrace if his views were revealed, and concern about upsetting his clergymen naturalist friends or his pious wife Emma. Charles Darwin's illness caused repeated delays. His paper on Glen Roy had proved embarrassingly wrong, and he may have wanted to be sure he was correct. David Quammen has suggested all these factors may have contributed, and notes Darwin's large output of books and busy family life during that time. A more recent study by science historian John van Wyhe has determined that the idea that Darwin delayed publication only dates back to the 1940s, and Darwin's contemporaries thought the time he took was reasonable. Darwin always finished one book before starting another. While he was researching, he told many people about his interest in transmutation without causing outrage. He firmly intended to publish, but it was not until September 1854 that he could work on it full-time. His estimation that writing his "big book" would take five years proved optimistic."