Given that in a century or two it seems possible we would be incentivized and capable enough to cobble together intergalactic autonomous probes to blanket the g

Given that in a century or two it seems possible we would be incentivized and capable enough to cobble together intergalactic autonomous probes to blanket the galaxy and prevent any external civilization from wiping us all out, it seems most likely to me we should expect to find such a system already exists first.