Yes, there will be People Upvoting Trending Posts Blindly but those will be just Newbies with very less SteemPower which wouldn't make that significant of a difference.
Plus being in the Trending Page gets you a lot of Eyes even Eyes that would Flag your Post if the Post is not appropriate.
that's true. I got quite a number of flags for this post. i feel like an opposition leader in a country with a strong dictator & his cronies. lollll