Edit: DRK coins can currently be stolen
https://darkcointalk.org/threads/rc3-hard-fork-on-june-20th.1241/ and supports the hot/cold setup for masternode operators (allowing your money to not be risked at all.).
So, until DRK fixes its fork, all DRK coins transferred through darksend are at risk. That's why the maximum darksend limit is 10, not the bullshit excuse you posted above.
The node money is not any of the concern of those transacting money. It's the node owners responsibility to secure them, just like someone running an xnode can get his wallet emptied.
That's not the transaction money. It's the node's owner's money and they can be hacked/stolen like any other wallet. With cold wallets it will actually be easier to hack an xnode rather than a masternode.
When we say XC is stealing coins, we mean the transactions themselves which are trusted.