Definition of false colors in English English dictionary
{i} flag of a country other than the flag of own country; hypocrisy; misrepresentation; deceptive actions; (Nautical) flag of a amicable county that is flown by a pirate ship to mislead another ship into a sense of safety; flag raised for the purposes of deceiving during war
They were all not exactly sailing under false colours, but deceiving themselves as to their motives--and one another, to a lesser degree, by their actions.