[MattHeard]

Many consider breaking promises to be wrong and contracts to be promises, and so consider breaching contracts to be immoral.

Many others also consider the long-term negative consequences of breaching contracts to be worse than short-term positive consequences. If they consider short-term thinking at the cost of the long-term to be immoral, they would consider breaching contracts to be immoral.

To you, breaching a contract might just be another IF-THEN which is implicitly or explicitly coded into the contract, but others consider it to have moral weight.