It's unlikely an otter would choose a meal on land when there's tons of food in and on the water. Possible, but not probable.
They're also very important for the environment. If removal is necessary, contact your local branch of fish & wildlife or a rehab, so they can relocate the otters somewhere more suitable.
Just think about Beavers being airdropped from Helicopters!
That odd image is a true historical undertaking.
After the expansion of suburbia and cranky homeowners wanting the Beavers gone, by the 70's the population in many regions was non-existent.
While their dam building activities were seen as pesky, destructive behavior, the Beaver free areas eventually began to experience water retention issues. It was found the regions were unable to hold nearly as much water as they once did, in the aquifers, the forests, and so forth. Much more of the rainfall was being swept away in rivers towards other states / the ocean.
Turns out Beaver dams increase the ground water levels, support healthy forests, and help wildlife flourish.
This realization led to captive breeding efforts sponsored by the government, and eventually they undertook a release program in remote areas that were difficult to access.
The solution for delivery turned out to be air dropping from helicopters! One of the scientists involved invented a wooden-crate based shipping container that was held together by a rope system tied to the parachute. When the crate landed and the shute slackened, the crate panels opened, releasing the Beavers.
The project was largely considered successful in the participating regions. But too many areas did not want to participate, and continue to suffer problems.
While an Otter is not a Beaver, I hope this helps illustrate how essential some native residents can be in the ecosystem.
I also think that whatever tore the wing on your nesting Silkie was a strong predator, raccoons often do that sort of thing. And they don't usually disappear from an area... if someone eliminated the coons you were seeing, it would just be a matter of time before more came back.
Coop / yard cams are helpful for identifying predators. They can also show were the weak spots in fortifications are.
BigBlueHen gave some really good advice about fences and security.
