Why did Swami Vivekananda eat fish?

There has been a debate recently on whether a 'Siddha' can eat fish and is Swami Vivekananda a 'Siddha' as he ate fish?

Analysing what Swami Vivekananda did cannot actually take us to the truth. Reaching a conclusion will take us away.

At the same time, every event needs to be seen from a context. For example, if a school kid gets depressed on getting poor grades, then we tell him that marks are not everything. But we cannot tell this to a kid who anyways doesn't want to study.

Swami Vivekananda did leave non-vegetarian food when he stayed in the US. Why did he? What did Jesus eat? Did Jesus ask fishermen to stop fishing & eat vegetarian? Let's try to find the answers. But, at the end, we can just wonder.

Another food for thought- Why has nature in the first place made carnivorous animals who need to chase and kill other animals for food? Is there a choice?