I wish we had more Fidels and Guevaras in the world today. I don't think they would be preaching peaceful coexistence with the capitalists. I don't think they would be so naive as to think that you can peacefully coexist with capitalism. It will seek their destruction and they will be forced to change path from this one way or another.
I see it as an ideological mistake as large as democratic socialism is compared to revolutionary socialism. You can not expect them to not seek your violent destruction just because you played nicely. You have to seek revolutionary socialism because they will not allow a peaceful alternative. In the same line of thinking they categorically will not allow peaceful coexistence either, you have to seek revolutionary coexistence.