I was in my early 20s and it definitely was a moment when I realized things weren’t what they seemed. I also fell for the narrative for a bit. Then a couple years later when it was revealed that the WMDs in Iraq were made up it started to all make sense. This country operates the highest, most advanced form of propaganda and corruption. It’s how it stays in power.
I also believe this is what Israel is going through now. Leveraging primal blood lust to justify what being committed. No wonder the US is supportive.
You computer has a feature for Out of Band management. Either WoL as others have mentioned or vPro(Intel), iLon(HP), iDrac(Dell), as well a few other less popular systems depending on who makes your mainboard or NIC.
This leaves the power on to the network card so that it can be used even with your computer off. It does not have access to your normal computer in the this case. Just the ability to turn on/off the system and sometimes options to update BIOS/UEFI firmware and send a console image to either a client or browser.
The lights are blinking because broadcasts packets from other devices on your LAN are sent to every device. This is normal and expected behavior.