Depends on your stance on the death penalty.

Article 37 of Anglicanism holds the stance:

The Laws of the Realm may punish Christian men with death, for heinous and grievous offences.

It is lawful for Christian men, at the commandment of the Magistrate, to wear weapons, and serve in the wars.

However, many other people may have other stances

##Christian arguments in favour of capital punishment Some Christians argue that capital punishment helps to maintain order and protection in society. The Bible sets down the death penalty for some crimes, so it must be acceptable to God. This is often seen as retribution. The Church of England has not repealed the statement in Article 37 of its Thirty Nine Articles which says, “The Laws of the Realm may punish Christian men with death for heinous and grievous offences.”

Saint Thomas Aquinas argued that peace in society was more important than reforming the sinner. He reflects the Roman Catholic Church's teaching that the protection of the whole of society is more important than the individual. ##Christian arguments against capital punishment Some Christians would argue that capital punishment can never be justified. They would say this because:

They believe Jesus Christ came to Earth to reform sinners, as he did with the woman caught in adultery in John 8:1-11. Jesus amended the Old Testament teaching on retribution in Matthew 5:38-39 when he said, “You have heard that it was said, 'Eye for eye, and tooth for tooth.' But I tell you, do not resist an evil person. If anyone slaps you on the right cheek, turn to them the other cheek also.” Christians believe in the sanctity of life – this means that life is holy and belongs to God, therefore only God has the power to take life. In Romans 12:17-19 it states, "Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everybody … Do not take revenge, my friends, but leave room for God's wrath, for it is written: 'It is mine to revenge; I will repay, says the Lord.'”

Source: BBC Bitesize, CCEA Religious Studies

I wouldn't say that voting for Trump would make you a bad person. Or supporting him in the context that you believe he is better than the opposition. But it is down to reasoning also. Kamala Harris made some blunders or had policies which may have caused people to withhold their vote from her out of conscience.

If someone is supporting trump because they believe abortion is murder and that Trump could end it, or that his economic policies are somehow better, or that he'd better society, I wouldn't see them as a bad person. I would, however, if it was because they held hatred of a racist, homophobic or a transphobic nature. I don't think simply supporting trump could make you a bad person, but the reasons you do could make you one.