The fifth amendment prevents the government from seizing private property without just compensation because

The fifth amendment prevents the government from seizing private property without just compensation because  otherwise the government could deprive citizens of the right to life, liberty or property w/o due process of law.
If the government has the right to seize it without any compensation, every citizens have to burden the risk of economic downfall by the government throughout their lives

Ataxation measure enacted to raise revenues for a standing british army in america