Is having an addiction an excuse for this?

My partner has spiraled into addiction with crack. He has stolen money from my dad’s bank account (more than once) even sneaked in his house and took his bank card (my dad is blind) he denies all of this even when my dad caught him
In his hallway one day, does having an addiction excuse this behavior? And would you guys be able to forgive?
Is having an addiction an excuse for this?
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