The funny thing about this whole mess is that there was such an easy and simple solution for everyone if they were just to talk for a minute instead of instantly trying to kill or capture the intruder.
The solution would have been to negotiate a deal. They got 9 days (or less) before the deadline and the intruder's goal is, ultimately, to fight against the bugs so the simplest solution would be to make a deal where everyone help the trio until the last moment where the trio would surrender for execution to avoid having all the people killed.
After all, there were no condition other than to have captured dead-or-alive the trio before 10 days.
But, then again, it's not like the average people in those village had any kind of intelligence for tactics and negotiation.