YES or NO? COMMENTS on SEO-Optimized Pages?!

Just a Simple Question:
Do you activate Comments on your (for specific Keywords) SEO Optimized Pages?

YES or NO?

Argument for Yes:
- more Text so more Longtail Search Engine Traffic
- users can engage and can add insightful comments

Argument for No:
- could destroy your Keyword Density for your specific optimized page

Up to now I disabled comments for my Seo optimized Pages, but I am not sure if this is a really good idea anymore, because theoretical even if user-comments would harem Keyword Density I could post my own Keyword-Rich-Fake-comments..

So what do you prefer? And why?

Hope to get some insightful ideas and inputs about that topic.
And thxs for reading:top:

moderate your comments

id say moderate but leave them on se do see those comments ... im a fan of seo but ive noticed some ive my sites that have sh ty seo do really well with all the better people not seo driven content ... blasphemy i know ...