Can any one tell why this answer is deleted?
The post was deleted because it basically did nothing to answer the question. The question was asking for proof, but the answer did not provide it: It just made a claim ("Yes it was Yazid who ordered…") and listed a bunch of narrations.
Absolutely no attempt was made to establish either the credibility or the authenticity of these narrations, nor indicate what if any relevance they had to answering the actual question. They're simply…there.
Without any indication that these narrations are credible, the only support they provide to your claim is in their quantity; there's a lot of them, so they must be right. However, this support is entirely an illusion based on selective bias: Presenting only evidences that support a claim while wholly ignoring evidences that go against it is a prime example of the cherry-picking fallacy.
And in the case of this answer, in lieu of any argument to the quality of the evidences, the quantity alone proves absolutely nothing. A half-dozen, a dozen, even a hundred weak evidences are nothing to a single credible report which contradicts them. If you want the quantity alone to support your claim — a strategy I would very much not recommend — you would still need to present a compelling argument that credible counter-evidence does not exist.
Your post didn't provide that either.
And even if — and I'm stressing the if here — any of these evidences are credible and/or authentic, or credible counter-evidence does not exist, there is absolutely no attempt made to establish relevance: Why is quoting all four narrations verbatim — in Arabic and in English — even necessary? What makes four better than one? What makes full quotations better than in-line references? If one evidence can demonstrably prove a position, there's no need to bring in four, but if one evidence can't prove a position, what reason is there to even include it? Again, as presented it just simply looks like you're trying to emphasize the quantity rather than anything else.
Given that this list-of-evidences does nothing to actually bolster your claim, despite taking up three-quarters of your post, the whole thing pretty much looks like an attempt to push apologetic rather than any attempt to answer an actual practical question, which is not what the site is for.