The cruelty of a one-star review

Should I have been kinder in my one-star review of 7:84's Free-Fall today in The Guardian? In normal circumstances, it'd be just another show, but the company is under threat of closure because of funding cuts from the Scottish Arts Council and it's cruel to kick a man when he is down. I wondered about giving it two stars, but the only reason I could think of for a second star was I felt sorry for the company. That didn't seem to be a very good reason. Still, the show has received three-star reviews elsewhere (even a four-star in one case), so it's only my opinion.