Let me copy pasta myself here to save time and just say - they are already murdering us in the millions, any harm that might come to them is an act of self defence.
Look around - the violence is already here, it has been inflicted on to the working class for centuries, killing hundreds of millions (at least, in all that time) for profit in war, with hunger and restricted access to water, with homelessness and poverty, with preventable disease, with climate change, with immoral laws and entire systems designed to keep large segments of the population as slave labour, which is what they used to gain their power and wealth to be in the position to impose all of this in the first place. And all that just off the top of my head, there is so much more violence that is inflicted on us daily, they've just got most people convinced that's just life, when it really really isn't. And those who actually benefit are never just going to give all of that up.