Here in the States, we have the 5th Amendment under our constitution, which prevents forced confessions of self-incrimination, even though forcing such confessions might actually help catch more crooks. So, why do we have this? Because the alternative is worse, namely forced confessions. Do we really want this? Not imo.
There's another issue here as well, namely that if people who have committed a crime well know that their confession may be forced out of the priest hearing it, then why in the world would they go to the priest? The end result is they likely won't go. Then by him/her not going, the priest is in no position to help out the situation, so nothing is gained and some things may be lost in the process.
When I turned 30, I converted to Catholicism and was active for 20 years before leaving, so I did go to confession many times. At no point did I walk in, confess my sins, and just have the priest say just something like "Say three Hail Mary's and two Our Fathers". No, instead what took place was at the least a short conversation, often with the priest trying to get at the root of the problem and how maybe I could handle it better than I had.
By doing what some here are recommending, what would be lost is the opportunity for the priest to help out because people are less likely to go, therefore nothing would likely be gained overall.