Just like there are very well educated but still bad scientists, very well trained but still bad singers, very high in position but still bad politicians, etc., etc., etc., there are also very vocal but still bad Christians.

The Bible is full of directions and warnings against oppressing those who are weaker. Those Christians who ignore or reinvent these are no different than an incompetent scientist who fakes or mucks up data, etc.

More, the New Testament explicitly warns that bad Christians will exist and that they should be ignored (and will not receive the rewards they think they will).

Some examples:

Defend the weak and the fatherless; uphold the cause of the poor and the oppressed. Rescue the weak and the needy; deliver them from the hand of the wicked. (Psalm 82:3-4)

Whoever oppresses the poor shows contempt for their Maker, but whoever is kind to the needy honors God. (Proverbs 14:31)

The righteous care about justice for the poor, but the wicked have no such concern. (Proverbs 29:7)

Is not this the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free and break every yoke? Is it not to share your food with the hungry and to provide the poor wanderer with shelter-when you see the naked, to clothe them, and not to turn away from your own flesh and blood? Then your light will break forth like the dawn, and your healing will quickly appear; then your righteousness will go before you, and the glory of the Lord will be your rear guard. Then you will call, and the Lord will answer; you will cry for help, and he will say: Here am I. If you do away with the yoke of oppression, with the pointing finger and malicious talk, and if you spend yourselves in behalf of the hungry and satisfy the needs of the oppressed, then your light will rise in the darkness, and your night will become like the noonday.” (Isaiah 58:6-10)

When you reap the harvest of your land, do not reap to the very edges of your field or gather the gleanings of your harvest. Do not go over your vineyard a second time or pick up the grapes that have fallen. Leave them for the poor and the foreigner. I am the Lord your God. (Leviticus 19:9-10)

Do not pervert justice; do not show partiality to the poor or favoritism to the great, but judge your neighbor fairly. (Leviticus 19:15)

If any of your fellow Israelites become poor and are unable to support themselves among you, help them as you would a foreigner and stranger, so they can continue to live among you. Do not take interest or any profit from them, but fear your God, so that they may continue to live among you. (Leviticus 25:35-36)

If anyone is poor among your fellow Israelites in any of the towns of the land the Lord your God is giving you, do not be hardhearted or tightfisted toward them. Rather, be openhanded and freely lend them whatever they need. (Deuteronomy 15:7-8)

The King will reply, ‘Truly I tell you, whatever you did for one of the least of these brothers and sisters of mine, you did for me.’ (Matthew 25:40)

Suppose a man comes into your meeting wearing a gold ring and fine clothes, and a poor man in filthy old clothes also comes in. If you show special attention to the man wearing fine clothes and say, ‘Here’s a good seat for you,’ but say to the poor man, ‘You stand there’ or ‘Sit on the floor by my feet,’ have you not discriminated among yourselves and become judges with evil thoughts?” (James 2:2-4)