Stop removing the space between the last and second to last paragraphs

In the text editor, all paragraphs are spaced evenly with two line breaks between each paragraph. However, once a post is submitted, one of the line breaks between the last and second to last paragraphs is removed. (Look at the image to see what I mean.)

This is bad for readability because it makes the response more like a wall of text, and worse, breaks the paradigm of What You See Is What You Get - students aren't posting quite what they think they're posting.

This applies to responses and possibly to supporting/counter points, but it doesn't apply to questions (although from the CSS, it looks like it's meant to).

The fix is simple: delete the seven lines of code that set p:last-of-type for each kind of post to display:inline. (Of course, that might have undesirable side effects I can't anticipate, but simplistically, it would fix this issue.)