I believe the answer is: They protect justices from political pressure.
If supreme court is replaced every time the president is changed, the chosen supreme court would most likely feel pressured to conform to the will of the political parties that help his/her election. To prevent this, the supreme court is appointed for lifetime.
The debt caused Britain to tax the colonists, which made the colonists angry
The Gupta Empire<span> is generally held to have begun in 320 AD, when Chandragupta I (not to be confused with Chandragupta Maurya, who founded the Mauryan </span>Empire<span>), the third king of the </span>dynasty<span>, ascended the throne. He soon began conquering neighboring regions.</span>