4 Bible Verses about Eighteen

Rehoboam loved Maacah, Absalom's granddaughter, more than all his other wives and concubines. He had eighteen wives and sixty concubines. He fathered twenty-eight sons and sixty daughters.

Meshelemiah had sons and relatives, who were able men, eighteen in all.

With the help of our God they got for us Ish-sechel, one of the sons of Mahli, the son of Levi, the son of Israel; and Sherebiah with his sons and brothers, eighteen;

What about the eighteen people in Siloam killed when the castle tower fell on them? Do you think this proves that they were worse than all the other people living in Jerusalem?