In all of this it's important to remember that you've licensed your content to SE and while you still hold the copyright, they have the right to distribute that content. Also note that the system generates a flag if you delete too much, too quickly. There are times when your right to delete content clashes with SE's right to distribute said content.
For me (speaking as a moderator on several sites) it all depends on how many of your posts you are deleting and over what time frame. It also matters, in the case of answers, what the score is and how many competing answers there are.
If you're just deleting one or two posts every month or so then that's generally not a problem. If you're deleting low scoring answers where there's at least one competing answer to the question then that's generally not a problem. You're probably just removing content that either wrong, outdated or doesn't add anything new.
Where it get's complicated is when you're deleting large numbers of posts over a short period of time or yours is the only answer.
In the first case that could be a sign of a rage quit. This is often (but not always) accompanied by the vandalising of posts that can't be deleted - questions and accepted answers. In these cases we need to know and restore the content.
In the second case we have to consider whether having a partial answer is better than having no answer at all.
So, to sum up. It all depends on why you are removing content. If you're doing it because the post isn't useful then that should be OK. However, if you are doing it because you want to make a point, you don't want your content on SE or some other reason then that's not OK. As I said at the start of this answer, by posting you've given SE the right to distribute your content. If you don't want them to have that right any more you need to contact them directly and sort it out that way, most likely by having the content disassociated from your account.