There is no straightforward answer to this question. Assuming that your infrastructure is "secure" because you deployed an EDR solution is wrong. It only gives you a false sense of security.

The reality is that security takes a lot of effort from everyone involved, and it starts by educating people. There is no quick bandaid solution to these problems, and, as with anything in IT, any approach has tradeoffs. In this case, and particularly after the recent events, it's evident that an EDR system is as much of a liability as it is an asset—perhaps even more so. You give away control of your systems to a 3rd party, and expect them to work flawlessly 100% of the time. The alarming thing is how much this particular vendor was trusted with critical parts of our civil infrastructure. It not only exposes us to operational failures due to negligence, but to attacks from actors who will seek to exploit that 3rd party.