Well, those laws all exclude mentally ill people because they claim we're inherently capable of making a rational decision to end our lives, which I think is a load of BS.

It's also, I think, a load of crap to say that we don't really need assisted suicide laws because anyone can just kill themselves if they really want to. That's not actually true, as evidenced by the number of failed suicide attempts. Many websites that discuss methods have been taken down, and sometimes the content creators have even been prosecuted. Access to materials has been, in many cases, restricted. People who are publicly suicidal (jumpers, etc.) have the police called on them and are sometimes stopped by force, and then they can be detained indefinitely on a psych unit because people determined to have a mental illness have few civil rights in practice--and in these cases, wanting to die is considered proof positive of mental illness despite any other circumstances.

Assisted suicide laws make sure that people who want to die actually do die, that it's not a botched attempt that could leave them worse off than before. It removes intervention from police and psychiatry. They help people die with a minimum of suffering. There's a HUGE difference between that and the desperate suicide attempts a lot of people feel forced into.