Almost all forums that I have ever signed up to have a facility to delete your account and also your contributions to discussions.
How can you do this on WP? Simply saying that you can't would probably make the site illegal in UK/England/Britain where we have some new laws about data retention and protection coming in next week(??). Particularly given the nature of our Aspie/ASD community I think it is really important that members should be able to "bow out" leaving no trace of their being here if that is what they wish.
Tonight I am feeling vulnerable, tomorrow I may not, but it will be sad if what I write here passes out of my control once I have written it.
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AQ 44/50
ND 144/200
NT 72/200
EQ 12/80