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Because their objective is to get the problem/issue resolved as quickly as possible, withdraw their Bitcoins/altcoins, and deposit then play again later with a smoother experience.
The trolls probably know that they have done something illegal and that they will never see their coins back in their wallets again. There's nothing else to do but to try to destroy the casino's reputation. Merely add them to your ignore list. Some of them are probably using two or more newbie/brand new accounts to pretend that they are different people.
Can't solve the problem immediately, if it is legitimate then the security department team will usually investigate and check for some time... If the allegations are legitimate then they will wait for further news.
The usual trolls will not have strong arguments, they will just accuse the casino without clarity... right better in the ignore list this is not important, even the casino does not care about the claim.