I will start out by saying that I hear you guys, I am listening not just brushing this off, but let me give my thought process here relating this.

I will say right now that the following comes from my understanding of electricity and circuits. I don't have a PhD, but I have been around.

If 1 of the SSD's was at fault, then there should be no way for the other 2 to burn up.

Example: Let's say I have a toaster, blender, and a lamp on a circuit. The lamp is on and I put some toast in the toaster and some concoction in the blender. The blender suddenly becomes jammed which increases the load on the motor and causes more current draw, the motor then overheats and burns the brushes/coils/whatever before the circuit breaker blows.
The lamp and the toaster are fine because their internal resistance is still in line with operating specs, just because the blender drew a bunch of current, doesn't mean the other devices saw all that current.

All 3 SSD's would have had to have a failure at the same time for all of them to burn, which pushes the odds even farther into the very unlikely.

Now, if I were to go to the circuit box and reverse the ground and the hot wires on that circuit, all 3 devices would fry instantly when they were powered on because current is going to the wrong place.

That is what most likely happened here given that all 3 devices on the string all fried. If 1 of them went bad, the other 2 would not go with it.

Someone is going to come along and shoot holes in this because I used an AC example instead of DC, but just replace my devices with 3 DC devices, it still applies. The other devices in the circuit are not going to see the increased current, which is what does the damage. Revers the + / - and you would have all sorts of smoked equipment.