Actually technically those issues could be addressed using encryption. Use a threshold scheme to share the warrant key among multiple independent share holders

Actually technically those issues could be addressed using encryption. Use a threshold scheme to share the warrant key among multiple independent share holders. Use enough share holders and a high enough threshold to make the odds of enough share holders going rogue or being corrupted to reveal the warrant key lower than the odds that someone will brute force the key. In the limit you could make everyone in the country a share holder and require a large supermajority for key recovery.