You don't have to do anything. Live and let live. Whether he's come to this conclusion through experience or he's been told by a teacher, it's his business.
Don't feel silly for being polite. But keep in mind that professors are busy and probably get a lot of emails from students. Nobody wants to read 3 paragraphs of fluff. Keep it polite but succinct.
Also keep in mind that many professors think they're god's gift to academia. You may have run...
It's not quite clear to me what you mean. Usually a story is written in the simple past with some past perfect. I can't imagine a story written entirely in the present or present perfect. You can move into the present tense to add a sense of suspense or immediateness to some parts of the story.