The Empires have budgets that make capsuleer wealth look like nothing. Ignore the super old 1 isk is a fortune thing. Look at the bill for rebuilding Myrska, and compare it to the cost in USD to build something like Tokyo after a Godzilla attack… because people have calculated the later one. It’s pretty much 1 to 1 given Myrskas larger size.
(we are still filthy rich, I mean we measure incomes in millions per hour).
So a head of state having a soft clone would be hardly a drop in the bucket.
The other reasons of religious or even personal ones might apply though. They were good reasons.
I’m curious to know what other major NPCs have died and no mention at all of clones. Even some of the mission npcs get mention of having clones.