Weight cutting, done properly, is not a danger. People certainly take it too far, but I personally favor the day before weigh in. My reasoning is: people will cut weight regardless. However, weighing in the day before allows a persont o rehydrate. That lowers their risk of physiological issues. They step on the mat heavier, but healthier. I understand the argument against it from a mutual benefit and welfare standpoint, but as wirh many topics, I tend to favor the "teach people to use the tool responsibly and safely" approach over the overt ban/discourage method.
Example: i just cut from 210-215 to 182.5 in about 8 weeks. I ate clean, changed my workout regimen including more plyo and cardio and less heavy weightlifting, etc. i "cut" about 2 total lbs of water at the end, and felt fine about an hour and 2 gatorades after stepping off the scale. I had a more fun and educational tournament because I wasn't just trapped underneath big gorillas all day. I fought guys my size and had a great time. Used responsibly, I had no difficulty making weight using sound cutting strategy.