Any denial argument weaves into a web of discrimination under the same argument as same sex couples.
No it doesn't. "Discrimination" buy it self is neither "good" or "bad", it is how that discrimination is arrived at that is the important criteria from a legal standpoint. When discrimination is enacted to target a specific group for different treatment, the measure is a "compelling government interest" for treating
like situated groups differently. In other words given the same circumstances and applying the same standards - what is the underlying basis for the different treatment.
Take for example Driver's Licenses, we discriminate all the time - but not on the basis of race, gender, sexual orientation, ethnicity, country of origin, etc. Discriminating against those who demonstrate a willingness to operate the vehicle on public roads in an unsafe manner for example. Or against people that are blind as another. The compelling government interest being public safety on public roads.
In the case of SSCM then the government must provide a compelling government interest for like groups being treated differently when establishing a family relationship where one did not exist before. In this case those groups are law abiding, tax paying, US Citizen, non-related, infertile, consenting, adults in a different sex relationship and law abiding, tax paying, US Citizen, non-related, infertile, consenting, adults in a same sex relationship. To date no compelling interest has been put forward. The arguments usually center around tradition (not a valid interest of the government), it's against the dogma of some religions, it's immoral, or it's "icky" - none of which are valid government interests resulting in capricious and invidious laws.
What Redfish is saying, is there is no basis to deny consenting adults from choosing a life of polygamy. What argument can you provide for allowing one lifestyle while denying the lifestyle of another?
However from a modern perspective there are still valid reasons against legalized bigamy.
Legal View: There is no legal framework to deal with partners in a Civil Marriage that exceeds two persons and the issues that are already complex enough dealing with two individuals and possibly children let alone increasing those issues exponentially with each additional spouse.
In each bigamous marriage, there would be at a minimum three legally intertwined status:
A married to B,
A married to C, and
B married to C.
Add a fourth spouse and you get:
A married to B
A married to C
A married to D
B married to C
B married to D
C married to D
Add a fith spouse and you get:
A married to B
A married to C
A married to D
A married to E
B married to C
B married to D
B married to E
C married to D
C married to E
E married to D
Add another, etc...
So you have issues with property on who owns what, what was brought into the marriage when. If C decides he/she no longer wants to be part of the plural marriage to what extent is he/she awarded property from A, B, D, and E.
You have issues also with children. Who are the parents. The biological parents or are all adults in a plural marriage equally parents. In the event of a divorce who gets child custody? Visitation? Child support? etc...
When the discussion is about marriage between two consenting adults the current legal system will support it because laws, courts, etc... are geared toward dealing with the same situations. Linear increases in the number of spouses causes an exponential increase on the courts in dealing with those issues.
So there is a secular reason to be leery of bigamy as a government recognized entity that has nothing to do with religion or morality.
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