A theocracy is basically some human's version of God. The concept of God is authoritarian and dictatorial. It's a harmful idea.
Not all power is good power. Powers that protect equality and freedom for everyone while negating egocentric power is what's needed.
Most people I think are judged by their desirability, utility and their footprint in society. Any power that negates such human cruelty I am for.
A theocracy is corrupt humans acting as followers of a God, doing God's will. Nothing could be more egocentric as someone who thinks they are infallibly doing God's will.
Basically it's best to negate the cruelty of human nature by avoiding such egocentric power. No one needs a human version of God ruling over everybody.
Yes, the 'modern-day definition' of theocracy is: rule by clergy or clergy class.
However, that is Not the theocracy (God Rule) that Jesus promoted - Daniel 2:44
There is a BIG difference.
Jesus' view was Not a human version of a god ruling over everybody.
Rather, Jesus as King of God's theocratic Kingdom is No human's version.
Jesus, also as Prince of Peace will usher in global Peace on Earth among person's of goodwill.