At the moment, there is no difference in coding between friendlies that willingly come to help you compared to friendlies that come because you called for them. I totally agree that if I call them for help, and it end up with some deaths on their side, I should be penalized for it, (minus reputation). But if they willingly come to help my colony out during raids, I should NOT be responsible for their loss. My reputation with a faction just went from 95 to -40 just because they "decided" themselves that they will come and help me? sounds a bit unfair.
To add to that, there is also another one, manhunting pack. You will 100% get a reduced reputation if any ally faction colony died to a natural manhunting pack. Correct me if I'm wrong, but this is only here to prevent people from abusing the animal psychic pulser. Differentiate between "natural" manhunting pack vs animal psychic pulser, just making both work the same way is really a lazy thing to do.
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The first one is more of a balance issue than a bug; I'll have to consider it.
Manhunter pack one should probably be fixed, we'll take it.
Finally, calling us lazy is rude, pointless, and rule-breaking. This is your warning.