Rescue of abducted babies

I had a not-so-great time at the park on Saturday. I had met that photographer again, I'll call him R., a kind man who always brings lots of treats when he visits the little fluffies. We had found Rosso - poor Rosso who has been injured once more for three weeks now and is limping on three legs and only slowly getting a bit better, Rosso who broke his teeth back in December so I had to bring him food every day then. About three weeks later his teeth had grown back and he was fine; sadly his injured forelimb seems to take longer to heal now.

Rosso, sitting with feet sprawled out sideways,
so cute. He still can't use his right hand.

So for what happened on Saturday, while my attention was on Rosso, R. alerted me to a group of people on the opposite side of the water he had spotted carrying away a nutria. I jumped on my bike and rode around the lake to intercept them. I found them settled for some picnic, but they had two nutrias with them, both babies from Black Mommy's nest, the brown one and a black one.
I confronted them and they claimed they were just feeding them - they were indeed giving them some twigs with green leaves, but while a man was firmly holding the black baby with both hands, in the way you put your hands around someone's throat if you want to choke them. A woman held the brown baby which kept escaping twice.
I talked to them for a while, they were Italian and didn't speak English very well, and asked me about where I'm from and so on. Eventually they decided to leave and let the babies go. Both quickly made it into the pond, but they were away from their home place and seemed lost and disoriented, and I felt responsible for returning them home.
I managed to catch the brown one quite easily although some idiot with his kid was bothering me. (He was offended that I ignored his kid who was babbling to me in German, while I was obviously busy with more important problems.)
I brought the nutria baby back to the shrubbery by the BBQ place where they live and returned to do the same with his black sibling, which turned out much more difficult though. I even took off my shoes and waded into the lake, but the poor baby was so scared and kept escaping. R. was watching from the far side where he had stayed, and warned me it wasn't safe for the baby to swim into the center, since there are some very large fish in the water. To no avail, the baby swam all the way to the opposite side, so I rode back around. I found him back, having climbed out of the water, and I managed to distract him with some food and then to quickly snatch him up so I could bring him home. It pained me so much how scared he was. I held him close to my heart and, still barefoot, walked him over where I let him slip into the shrubbery to rejoin his siblings. R. and I went back there to check on them, and they were at ease now in their familiar location, coming to us again without fear.
Rosso also came back there once more - he's their daddy.
So it ended well but left me feeling very bruised and worried. I have no idea if those people would have let them go without my intervention, or what their intentions might have been, but in any case it was horrible enough of them to displace the babies from their home; they might or might not have eventually found their way back on their own, but straying around disoriented would certainly have put them at risk of severe exhaustion and more vulnerable to predators. What if R. and I hadn't been there at the right time? It's so awful that I can't ever be at peace, always having to worry that some idiots might do some shit to my beloved animals while I'm absent.

The golden brown baby with two black siblings. I don't know
which one of the black ones I saved, there are two more.

Daddy Rosso with one of his babies.

It's troubling enough that these days the water level of the pond is really low, and since it's artificial, the sides are vertical stones in most places, and the nutrias now have a hard time climbing out, especially the small babies as well as the injured ones, like Rosso, who can use only his left hand to pull himself up. There hasn't been much rain lately. Only on Sunday I worked out in the rain, which I didn't mind since it wasn't overly cold then, but the rain didn't last long, but instead the weather has turned freezing cold since yesterday (Monday), but no more rain.

Two other tiny babies down in the shallow water.
How to possibly climb up that high "curb"?

I brought some stones to build "stairs" for them.