A Commentary on the Book of Malachi chapter 2
The Temple will be re-built.
Malachi at the beginning of chapter 2 is speaking primarily to the Jews of Judah. They will not have been sufficiently fervent in their worship of the Almighty. The non-Religious Jews are being censured in these passages.
[Malachi 2:1] AND NOW O YE PRIESTS [hebrew "Ha-Cohanim," i.e. religious officates], THIS COMMANDMENT IS FOR YOU.
This passage is considered by some to refer to Aharon the brother of Moses. Both Moses and Aharon were from the Tribe of Levi. Nevertheless it could also apply to Levites in general. Descendants of Levi are prominent among Jewish Rabbinical Scholars. So too, are descendants of David many of whom are to be found in the Hareidi (Ultra-Orthodox Communities) in Israel and about 20% of whom are red-haired. David was also red-haired (1-Samuel 16:12, 17:42).
In the future they will be blessed.
Jeremiah (NKJV) 33: 22 AS THE HOST OF HEAVEN CANNOT BE NUMBERED, NOR THE SAND OF THE SEA MEASURED, SO WILL I MULTIPLY THE DESCENDANTS OF DAVID MY SERVANT AND THE LEVITES WHO MINISTER TO ME.
[Malachi 2:8] BUT YE ARE DEPARTED OUT OF THE WAY; YE HAVE CAUSED MANY TO STUMBLE AT THE LAW; YE HAVE CORRUPTED THE COVENANT OF LEVI, SAITH THE LORD OF HOSTS.
We have to tell the truth. We should not be hypocritical. If something is bad do not condone it. Evil is evil and needs to be excoriated. None of us know how much time we still have in this world. We all need to do the best we can with what we have. At the least to do good when we can do it and to refrain from evil. Many times we say things that are unnecessary. It is often better to say nothing at all if we cannot say anything good. Criticism however is sometimes needed. There are no hard and fast rules. A good attitude will usually have positive results so that is what we should try for.