RP Reason:
The Chaos Insurgency is not trying to cause chaos. The Chaos Insurgency is trying to weaponize SCPs and use them for our own gain to destroy the Foundation. The insurgency would not benefit from destroying the SCP universe's most popular and powerful SCPs they could utilize against the Foundation (SCP-079 is a great example). They would also not benefit from blowing up themselves. Even unmasking the veil of the Foundation is not in the interest of the insurgency. As the Foundation has contingency plans for this scenario, the public may seek to destroy the insurgency too for having several of their own SCPs. Overall, it doesn't make sense at all from a roleplay perspective.
Server Reason:
I think that this would be a very cool idea. However, there are several problems that I would like to bring up. First off, in the event a nuke does need to go off, there are things that would stop Researchers from testing or a Maintenance collecting trash, such as a mass SCP breach. With this, there is no stopping them, and you just interrupt their roleplay. Secondly, if you do it at the same time, someone is going to metagame you every two weeks. You would also need a Super Admin+ to be online to activate the nuke.
Also, there are several questions that arise from this. How long does the raid take to activate the nuke? What if there is little to no MTF online? What if no Super Admin+ was online? Which nuke would CI want to set off? Why do we want the nuke to go off often?