Should I write a book about my bad experience without evidence?

I went through bad experience that cause my life change and waste my life and time. I thought should I write about my bad experience by two con people?
They do get away with it and are still living but If I write about them, will I get sue by them?
If they can sue me then what is another way to write about without getting sue?
(I'm first time writer.)
Asked Jul 23, 2017

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