You're completely right.
Because as we all know, the trolls have absolutely no way of ruining our games right now, but everything will change when this _one _ champion will be released, because of that _one _ ability that can _potentially _ assist enemies.
Cause, y'know, the only way these trolls have to troll is to use abilities that help the enemy team, that's why you _only _ see Bard, Trundle, Anivia, Kalista and Tahm Kench trolls. It's literally impossible to troll with champions that have simply, offensive kits like Brand, no matter what you do, you will help your team.
You can't afk, you can't steal kills, jungle camps and farm and then feed it to the enemies, you can't go trio bot and leave mid undefended, you can't build 6x
and run into their turrets until you're 0-56-0, you can't verbally harass your team, you can't tell the enemy team where your team is hiding or when a gank is approaching.
You can only troll if you have team-neutral abilities.