how many people ended up dead as a direct consequence of the spread of nazifascistic thoughts, then words, then attitudes, then actions
In that case you're not arguing that attitudes, or words, are violence, you're arguing that actions are violence. Attitudes are not the same thing as words, and neither attitudes nor words are the same as actions. And the two former ones do not automatically lead to the latter, or even reliably so. And even if A did lead to B, which led to C, that would still not mean that A=C.
Words mean things and separation of concepts is important. Suggesting that because some thoughts might be aired as words, and someone might take damaging action based on those words, it follows that the thoughts themselves "are violence" or "constitute violence", damages that separation.