I'm sure they have a physical prevention on alloran, but I really don't think the other host being damaged is such a big deal:
1) Most people didn't go out of there way to hurt them selves and
2) Even if they did, I'm sure Yeerk-medicare can patch up a broken nose or smashed fisted-I recall an arm being attached somewhere when V3 was being "generous"
I mean lets face it, even if human involvement in fights was low, there was enough in there that without repair people would start to ask why every guy in the sharing had an eye patch, or looked like he'd been well, mauled by a tiger