Can we please buff towers?

Never before have I been so thoroughly tilted by one aspect of the game, first tower blood. Last game I was playing top poppy against a Trynd, this is a bronze game btw. I kill him and get first blood at 2:17 and then kill him again 4 mins into the game. Everything is going fine, I'm farming, just trying to sieze my advantage over my lane opponent. Then Trynd comes back to lane and I do a few bad trades with him, that's alright because I didn't die. Everything is fine, I back to grab some items, ninja tabi and bami's cinder and head back to lane. All of a sudden Yi is in my lane and they're both pushing down my tower. I kid you not in one minion wave they both cleared my frigging tower, it was at 1/5th of its hp by the time i got back to lane and they just sat there under tower killing it when I got back. This was at seven minutes into the game. I remember a time where seven minutes was where you started doing full damage to turrets and they were still REALLY bulky. How can a trynd and yi with no attack damage items be allowed to clear a tower in one minion wave while I back? What am I suppose to do? Yes I didn't have Tp because I didn't switch the summoner spells intime but that doesn't make it right for them to take my tower while I'm backed. The game was lost due to other reasons (cough Teammates tilting themselves and each other cough) but it was still incredibly tilting to me that he was able to do that.

TLDR; Enemy top laner and jg took top tower at seven minutes in while I was backed when they had no items.

Edit: this is the game inquestion http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2400242119/58121006?tab=overview