I'm thinking of storing guns in my tenants' basements against their wishes
Is there a reason why you want to act in such an ignorant manner?
I'm not ignorant! They're the ones with the issues!
I understand you need somewhere to store your guns, but storing them in the basements of your tenants will just cause them to feel uncomfortable and could possibly lead to a dangerous situation. Store your guns somewhere else that doesn't interfere with anyone else's safety.
They think they will hurt them if they try to get them.
This goes further than wanting to be store guns, have you ever considered that one of your tenants might be scared to be around them because of their own issues? It could be a major trigger for people, it could also be illegal based on someone's background. Are you willing to risk your tenants safety just for a place to store your guns?