Secure remote control requires secure systems, which in turn requires secure humans, and we will never solve this last requirement.
The way around this is by preventing systemic attacks. Analogous is how paper voting—while vulnerable to things like vote stuffing—isn't susceptible to the systemic problems that electronic voting typically is.
I'd say secure systems need to be based on the assumption of insecure humans. Nothing is absolute in security but we definitely should start the analysis expecting people to behave incorrectly and insecurely. This is not a new problem: https://en.wikipedia.org/wiki/Byzantine_fault_tolerance
The way around this is by preventing systemic attacks. Analogous is how paper voting—while vulnerable to things like vote stuffing—isn't susceptible to the systemic problems that electronic voting typically is.