It is statistically highly unlikely that you get these toxic trolls in a majority of your games. You have your account(s), and remember that we all play the game too. There simply are not as many trolls as people think on this issue.
You are correct I have made some assumptions - I have made them after reading your dismissive and combative replies to Jo0o and others on this thread. You refuse to accept that maybe, just maybe, enforcement is universal and your perception that it isn't is due to confirmation bias and memory bias. The bottom line is that enforcement is universal - it is literally automated for 99% of cases. The computer doesn't sit there and say "hmm who should I enforce today".
It is a well known fact of psychology that when someone experiences a negative experience, they will accentuate the negative aspects of it, to the point of them becoming hyperbole. The person experiencing a loss of a video game (or a team game in real life), will always attempt to place blame on others mentally. I'm not saying you're blaming others here, just that's how the brain works in general. Our brain will take that really unlucky gank mid and the fact that their warding totem was on 5 seconds more cooldown and turn that into the fact that they're trolling. You won't necessarily remember the truth that they were just victim to an unlucky gank. You will remember that they were trolling and that they ran up to the tower and died to both of them 1v2 under their tower. This is not a fault of you, but it is a cognitive bias we need to be aware of when discussing this kind of thing.
Likewise, when a player "runs down the lane" - did they AFK to use the restroom? Did they lag out? Were they ALT-tabbed checking an email from a professor? There are many other explanation other than trolling. The player that runs in circles around other champions? Maybe they wanted to let the other player cs and wait for a fight, but still make their presence known to deter any plays from the enemy. The player spamming emotes then diving? Those two things don't necessarily correlate. The types of behaviors you describe, when they do happen (running down lanes, diving under turrets alone for no reason) are detected and punished quite frequently when they are trolling.
The TLDR with all this is that psychologically speaking, it's much more likely that you are misremembering the games than it is that these players were actually trolling.
