Was anyone else disturbed by Scotty's final solution in Trouble With Tribbles? Yes, the were a danger to the Enterprise, but to just beam them to the Klingon ship where they probably would be killed in a violent manner as opposed to something which could be done more 'humanely' on the Enterprise. And then they all got a good laugh out of it...
Would you have had an issue if tribbles looked more like the rats they are? Tribbles are vermin.