The fraud can be tackle other ways than making banks to pay for the fraud. There are tons of ways like extra confirmations of the payment, thresholds on daily payments, payment delays or just having a setting in your bank account that you are allowed to make "high risk" payments.
But if you want to make the society to pay for vulnerable people, victims and friendly fraud, if we want to protect the eldery and others, these people can take an insurance against scams if they feel they are a vulnerable group. This is not a health issue, this is not a physical threat. This is not an epidemic. There is a cost of giving free insurance to these people, and a lot of them won't be eldery but the abusers fo the system. This was discussed in the article of Financial Times, and based on the news link, there is also a massive indirect cost for people by creating the unbalanced system of fraud reimbursement.
1 out of 8 UK people commit fraud, so banks can now prepare feel the cost of this new form of friendly fraud: