Often times when you want to understand someone you need to look at the enviorment that they were exposed to when growing up. The one thing that Russell experienced that had to be big was the civil war, since he was born in 1853. He had to be a teenager toward the end of the war and no doubt had read the accounts of the battles and knew many who had lost loved ones, if not hearing first hand accounts. This had a big influence on all as nothing like this had happened before. Couple this with the industrial revolution and you have a perfect storm of sorts that will make people think and try to find answers for where this world is going. This is one of the reasons people joined groups that had an answer (read Masons). Others came up with answers of their own such as Russsell although he plagiarized most of his writting. Also look at the word usage he used to described thoughts and this will also help you to understand the man. Many people were not just stoic but cynical after the war.
The question: Did he laugh or joke? You bet.....all the way to the bank
Did he play jokes on people? Big time......He started a cult and lead them down a rat hole!