The number of multiple accounts is increasing day by day?
Is that a question or are you making a statement? You can answer from one of your alt accounts if you prefer.
Multiple accounts should be covered.
With a blanket or Bitcointalk account insurance?
The catastrophe of good accounts is coming down for them.
Oh no, not the catastrophe. So much catastrophe.
They are replying to their multiple accounts with good ID but the moderator is banning the good accounts after seeing the replies of the multiple accounts which is causing loss to the good accounts.
The number of account mentions in your sentence is too high.
For all intents and purposes, I would say that none of you use multiple accounts. Work with your real ID knowingly and use your real ID.
Everyone has the right to use multiple accounts and many people do for valid reasons that make sense. For example, if you are out and about using a public network, you might not want to log in to your main account for security reasons. So, it makes sense to have an alt-account that you can use. Even if someone gets hold of it, the damage is not as big as it would be if you lost access to your primary account. There are other examples, but you get the point.