Tower HP & Armor

I am having a difficult time understanding why Riot lowered tower armor in early game. I think having squishy towers has a negative impact on the game, and I don't get why Riot nerfs their staying power.

I have three problems with squishy towers:

1. Having squishy towers does not reward consistent good play in a lane. It promotes a 1-mistake-and-you're-done philosophy. You can be winning lane hard, get ganked once by the enemy jungler, and then lose your team's tower easily. This is especially true in bottom lane where there are potentially 3 champions.

2. "The Rift is Darker" It's easier to be ganked now with the removal of stealth wards; and if you die, and the jungler + your opponent are decent HP still, you can bet for sure that your tower is now gone.

3. Isn't killing your opponent and getting the kill gold from his death enough reward in itself? Do you really need to add more funds to his bankroll, and more advantage to his lane just because he potentially got a lucky kill?

I would much rather see a system where outer turrets, for the first 15-20 minutes, could only lose 1/3 of their HP every 120 seconds max so your opponent would have to get to your tower at least 3 times in order to destroy it.