Liberalism stands for every form of immorality.
On abortion, liberals oppose the right to life per the Declaration of Independence.
https://defendingconservatism.com/info/Abortion
On gay marriage, liberals oppose democracy and the 1st Amendment's right to religious freedom by overturning dozens of state ballot referendums voted on in 30 different states while suing photographers that don't want to attend gay weddings for religious reasons. The LGBT have higher crime rates and homosexuality spreads through child abuse, which is why study after study shows they are more likely to have been abused, especially homosexually, as children. Even the Human Rights Campaign, the largest LGBTQ organization in America, acknowledges that LGBT are far more likely to experience childhood sexual abuse then the general population: "Within the LGBTQ community, transgender people and bisexual women face the most alarming rates of sexual violence. Among both of these populations, sexual violence begins early, often during childhood."
https://defendingconservatism.com/info/Homosexuality
https://www.hrc.org/resources/
Liberal Democrats supported slavery and opposed civil rights throughout history. Republicans voted in higher percentages for the 13th, 14th, 15th, and 19th Amendments as well as the 1957, 1960, and 1964 Civil Rights Acts, not to mention the 2002 Born-Alive Infants Protection Act and Partial-Birth Abortion Ban Acts to stop newborn children from being left to die.
https://defendingconservatism.com/info/Civil_Rights
Conservative Christians created religious freedom and founded America, which is why 8 of the original 13 states required public officials to be Christians. The legislation of James Madison and Thomas Jefferson shows they created inalienable rights based on Biblical principles that God gives mankind rights, per the Memorial and Remonstrance Against Religious Assessments, Declaration of Independence, and Virginia Statute for Religious Freedom.
https://defendingconservatism.com/info/Religious_Freedom
Most liberals and Democrats are atheists who do not attend Church. Liberalism and the Democratic Party are by definition opposed to Christianity and a belief in God. And since rights and morality can only be instituted by God, liberal Democrats are therefore diametrically opposed to morality.
And no, that doesn't mean all conservatives or Republicans are always in the right, people are flawed, and there are liberal infiltrators in the GOP.