Who is responsible for tenants damaged things when my storage unit was damaged when roof collapsed?

Tenants should always get renters insurance because when things like this happen, the landlord is not responsible. nor is the owner of the storage unit, unless there was negligence on their part. If the tenant doesn't have that insurance, they have to replace lost items at their own cost. They could always take the owner of the storage unit to court, but a judge will probably ask, "Why didn't you have renters insurance? That's what it is for."