As he originally announced his non-banning as being due to his fundamental principles, it's more than just changing his mind. He should at least clarify how his attitude towards freedom of speech on Twitter has developed. Personally I think he's being disingenuous as he doesn't seem to care about other people's safety following even his own tweets, so although I can understand him putting his own family first, he should now appreciate that his previous stance on absolute free speech is untenable.