Fomenting a coup is very different than toppling a regime through military force.

My biggest concern has always been that US military action against Iran would undermine domestic factions pushing for democratic reforms, at best leading to the installation of a different autocratic regime more amenable to US interests, at worst leading to a wellspring of support for the existing regime both internally, and externally in the form of alliances with other nations who stand to benefit from a reshuffling of the existing world order.

Nothing even close to regime change happened in Venezuela.