Why would the British Parliament say taxation was justified?

Americans were the colonies of the British and must contribute to the country as such.

Explanation:

During that time America served as a British colony. In a colony it is expected for every citizen to pay for taxes and heed to the laws of the mother country as if they were living in it. The British Parliament would have made the argument that since they are supplying the American colonies with armies it would be justified for them to pay their taxes, or to them it would be considered treason.

assuming that by westerners you mean americans. that they were mean and controlling and abusive to its peasants.

explanation: