Poor Tom and other RBS account holders DID lose almost all their money.
It was just replaced with a gift of public money.

There was no money left for Fred's enormous pension.
Public money had to be used to allow him to retire at 50 with an annual income of 30 working teachers plus a £3 million lump sum.

These abuses make decent people so angry that they do crazy things.
They might plea provocation, or mitigating circumstances, or diminished responsibility due to consuming rage.