What you guys aren't realising is that people with disabilities have less impulse control than other people. It is a problem across a wide range of behaviours - not just with their sexual impulses. They can be violent, act out, self-harm, damage property, set things alight, just to name a few. It is also beyond the control of the individual, so it isn't just a matter of teaching them self-control until they 'get it', it is a function of their disability and can't be controlled. So when it comes to controlling sexual behaviour there isn't always an alternative solution - the person can be non-compliant and oppositional when it comes to taking daily medications, and/or just not understand why they need the medication which leads to non-compliance.
This is why physical sterilization is sometimes the best option but it has to be done with respect to the person's dignity and well-being. It used to be done involuntarily as a routine and compulsory procedure, but as there were a number of people who were misdiagnosed as mentally disabled who were forcefully also deprived of their reproductive rights there has been a change in thinking and it is now done either voluntarily at the request of, or with the permission of the disabled person, or if the disabled person is cognitively unable to give consent, then after a panel of doctors and caregivers assess the situation.