Given that advocating the right to "die with dignity" tends to have as a side effect people who are disabled (or would just be expensive to treat) being killed against their will, it is not clear that this is in fact negative.

You assert that it "tends" to have this effect. On what evidence?

If this were the case, we might expect to see people who feared this happening to them to be migrating out of places (such as Oregon) where assisted suicide is legal.

If the opposite were the case, we might expect to see people who feared being kept alive in a state of torment to be migrating to places (such as Oregon) where assisted suicide is legal.

Which do we see?

If assisted suicide enabled the killing of inconvenient terminal patients at the convenience of their doctors, relatives, or insurers, we might expect a relatively high number of terminal patients to "choose" assisted suicide. If it did not so, we might expect a relatively low rate. For this, we might specifically look in places where assisted suicide has been legal for many years, such as the Netherlands.

Which do we see?