I agree with you and do the same. A turtle crossing the road is eventually a dead turtle. I've seen this a number of times. A friend of mine refused to give me turtles he found. He would help them accross the road. One got hit, and he recognized it as one he help 3 times before. Another young one got hit, and he twice moved it far back into the woods. Another got hit and was still alive (a cracked shell) and he had helped this one too. Now, he also believes that helping cross the road is not enough, eventually the get smashed.
Mark