When 1984 you start the story learning about how the society in the book is completely different than ours. The government (Big Brother) had total control over everything in the society. When you look for paradise or utopia in this book you cannot find it. When Big Brother took over everything the people were open to it because everything was being controlled by the government and people did not notice the difference.
They were not allowed to think for themselves anymore, the government had created a new crime, thought crime. Once that was in place it was very easy for the government to do what they want. Because Big Brother had so much control over everything at that point it did not even matter what they did. They could then just take as much power as they wanted and go with it. When you have complete control over every aspect of a society then you win. You have no weaknesses, you have eyes everywhere and if someone tries to stop you in some way you can jump in and stop it.
People become used to the way things are and do not ever think of a different way things could be done. The people become afraid to break the rules, they do not want to get on the governments bad side and they know they will be caught if they do because of the “eyes” everywhere.
Because Big Brother had no problem with taking control they were corrupted by the power and ran with it.