You are correct. At the population level, there is not a correlation or an inverse correlation between euthanasia and suicide rates in different countries with different levels of both these practices. Also, at the individual level, it's not possible to say that euthanasia is necessary to prevent suicide, because even in patients requesting euthanasia, the rate of suicide is very low. You have a number needed to treat of 10, and a number needed to harm of nine, meaning that 10 young people must undergo euthanasia to prevent one suicide, and nine die without any preventive purpose being served.
