[ithkuil]

I wonder if it's illogical to think that all civilizations must always pick the most logical of the options

[Supermancho]

Logical and optimum are not the same.

[yetihehe]

Those civilisations that make too much illogical choices probably die off.

[ithkuil]

True. But it's not a binary choice. All it takes is to make one sub-optmial choice for the universe to be filled up with von-neuman probes in all star systems