How to use deception in an Ethical manner...

Ethical behavior relies on a social contract.
This social contract, when broken, opens up all sorts of ethical dilemma's - if your not clear what it means t break the social contract.
Firstly, it is not an authority mandated contract, is contract based on the sovereignty of the individual.

'Common law' is one the first codified structures trying to encapsulate what social contract is.

So what is it?

In a nut shell, and from which all other points derive..

You are your own property, and you have property rights over yourself, and the fruits of your labors.

Social contract means respecting others, and by doing so - means not enforcing your will on others , through violence, coercion or theft.

Not too difficult, really.

Keeping the simplicity of the principle in mind, will make any of your ethical dilemmas much easier to disseminate and thus clarify, before enacting any actions.

Is it ethical to steal off a thief, for example?

It is if the thief has stolen your property...- not only is it entirely ethical behavior, the redress of the imbalance is to be encouraged.
Does that now make you feel a lot better about not paying your jailer?
I hope so.
Taxes are your jailers wages, which then helps him to imprison you.

Anyone even wanting to cast moralizing dark look in the direction of such behavior, is working for their own jailer.
They are helping in their own prison, to stay a prisoner.
The system will come tumbling down the quickest , through noncompliance of the inmates.

Clean your head.

The jail can only keep the prisoners locked up while the Stockholm Syndrome victims/ sufferers, continue to help them.

To not act ethically...

....is to further enable, and support - the corrupt authorities, the coercion, and the theft..

Stockohm syndrome vaccinations and treatment. #1

Find the strength to stand up straight and once achieved (it helps if you look in a mirror at this point)...you'll find the infection of Stockholm syndrome is sucked out by gravity, and will exit promptly, out at the base of your spine.
Then stomp on the yellow fucker until it's dead.

Prevent any further re- infections by disregarding any authorities advice and 'help'.
Forever.