The other team has more trolls statistically
A little insight, the other team is more likely to get a troll than your team is, if you can rule yourself out, then you have 4 possible trolls on your team, and they have 5, and since they are all being drawn from the same player pool, they are all equally as likely to be trolls, therefore the other team is 1.25x more likely to have a troll.
Just a little bit of maths for you guys.
(Inspired by http://boards.na.leagueoflegends.com/en/c/gameplay-balance/Ar3QAPes-people-arent-out-to-get-you)