You are just making assumptions as to how the system works without even ATTEMPTING to actually understand it. Go look at the general thread list sorted by "hot" right now. The current list is showing threads with the following number of upvotes:
7 - two reddits!!
6 - I hate this
3 - Riot isn't even Sorry
3 - [Idea] Bringing in some usability~
2 - [Feedback] I really don't mind....
3 - @Riot, please steal the lights.......
1 - How do you even tell if....
1 - You can't see a preview of the post by....
1 - Is it a bug or something?
1 - [Feedback] No 'Back' button insi....
.......
then way further down are threads with 9 upvotes, 19 upvotes, 14 upvotes, 12 upvotes, etc.
It does not simply sort by who has the most upvotes which is what you seem to believe. And while I can't say for sure because there are no examples to draw a conclusion from, i'm pretty sure that Riot's "hot" algorithm will show "downvoted" threads as being "hot" because those threads are drawing traffic (views, up/downvotes, comments, etc...)