But not many have the balls that Winston had.
What sets Julia and Winston 'above all else' (or so to speak), is their ability to rebel and with a clear conscience of doing so - of knowing that what they are doing is wrong. Whilst, others like Parson dislike the Party but do not have the capability of rebelling. An example of this is when Parson shouts, "down with BB" in his sleep, without realising he did, and then praising his daughter for turning him in. This symbolises the extent of the dire totalitarian system, and how even the most fervent party members do not, and can not get away.
But we can ask our selves why wasn't Winston unpersoned like all the others?
I believe that Party allowed Winston to continue his rebellion, and his forbidden lustful relationship with Julia, to put in his 'mind' a sense of "hope". The comparison to the bleak setting and the golden country, the new wonderful changes that occur when he meets Julia paves way for this to unfold. But when all this is suddenly taken away from him, it creates a sense of doubt, and therefore, restricts Winston to believe that there could be anyone that can overtake the party.
However, another reason is for the Party to learn more about Winston, and what he ultimately wants to achieve. Sure, Mr. Charrington knew about the diary, and O'Brien knew about his eager want of alliance with the Brotherhood, but they didn't really know what he, Winston, wanted to achieve.
Also, during this time, the Party learns more about Winston. For example, they learn that he is frightened of rats, and therefore use it against him. They didn't and wouldn't have known this, otherwise.
"Under the spreading chestnut tree
I sold you and you sold me
There lie they, and here lie we
Under the spreading chestnut tree"
I think he was not vaporised in order to remind him of what he had down. Take note of when the three traitors, Jones, Aaronson and Rutherford, broke down when they heard this song through the telescreen. Winston also broke down in tears when he heard this song playing in the chestnut tree cafe.
In a way, the chestnut tree represents the Party, and how it is "spreading" their force onto the the people - which in turn, reflects that no one can escape.