Difference between 'casualty' and 'victim'

Solution 1:

One of the differences is that victim is a role, ie how we are viewed by ourself or others. Compare these alternatives:

2a. I won't allow myself to become another casualty of these people.

I won't allow myself to be hurt by them.

2b. I won't allow myself to become another victim of these people.

I won't allow myself to be hurt by them AND/OR I don't want to think of myself as being a victim, ie to take on the victim role in my relationship with them.

"Casualty" doesn't have this connotation.

I think that in your first example you could use "victim" without changing the meaning.