The two competing legal foundations of civil commitment are (providing care to people who need it) and (protecting society from harm).

1.  parens patriae.

2.  police power

Explanation:

Parens patriae is a widely known Latin term used in socio-political and law context, which literally means “parent of the fatherland." It described the law-related issues that pertain to government's capacity to act as the legal guardian for individuals or citizens who are incapable to look after themselves

On the other hand, Police Power is a term that describes the power of the governments to oversee the attitude of individuals and enforce order within their sovereignty, in order to promote the development of the health, safety, morals, and general welfare of their citizens.

Hence, The two competing legal foundations of civil commitment are PARENS PATRIAE (providing care to people who need it) and POLICE POWER (protecting society from harm).

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