This isn't a question of Republicans vs Democrats, although those Party alignments seem to be a predictive factor, more often than not. Party should be immaterial, irrelevant, moot.
It is a question of whether a ruling or piece of legislation is Constitutional or not.
Either the justices uphold the Constitution, as amended, or they do not.
In that context, case law may be a guide, but ultimately is irrelevant and insignificant compared to original intent as reflected in the letter of the law--in this case, the COnstitution. The latter is being ignored by half of the court, and often, one more.
Roberts' decisions, and those of the justices who voted to uphold Obamacare, through the most obscene contortions of jurisprudence, did not uphold the Constitution. Rewriting law in order to rule it Constitutional is not the purview of the SCOTUS, that duty is confined to the Congress. This was an egregious violation of their oaths of office.
Any who voted that abortion of an opinion to be Constitutional violated their oaths as well.