You should realize, that there is no alliance, that will protect your T1 unfitted haulers on their day trips. Maximum, what you can get is a large blue list, so less poeple will shot you. Your hauler was killed by a suicide ganker and there is almost no way to ensure permanent protection against such action. Punishment - yes, but not protection. Right now your corp painted really big fat target sign on your back. Rather disband, ground a new one and never ever post something like that on the forum
- Learn how to MWD/cloak your hauler if you insist on staying in high sec.
- Move to some protected null, like Delve, Esoteria or Vale of Silent. There you can get protection, not promise of revenge.
- If you get constantly war dec’d, disband and recreate your team again, use alts in NPC corps to ship your goods to trade hubs.