Obviously, for Christians, “evil” is defined by the Holy Bible.
The Holy Bible condemns murder, but the Democratic Party of the United States of America supports the freedom to kill babies with the protection of US federal and state laws. Not only that, the Democratic Party and its leaders, such as Hillary Clinton, push for using US tax dollars to support anti-Christian feminist organizations, such as the Planned Parenthood, which push for an anti-Christian America, thereby making all Americans guilty of participating in killing of babies (through tax dollars).
The Democratic Party also pushes for the freedom of homosexuals to engage in illicit and immoral activities that go directly against the Holy Bible and the morality of God in Heaven as expressed in the Holy Scriptures. Gay Marriage Laws, espoused by the Democratic Party, aggressively and publicly, make America into a nation that directly stands against God and God’s Word as a matter of official national policy, thereby creating a fate of Sodom and Gomorrah for the nation and the people.
No true Christian can be a Democrat, under the current official platforms of the Democratic Party.