Explain this matchmaking

Why do you matchmaking system place bronze 3-4 players in a game of silver 1-2 players? You don't see silver 3-4 players in a gold game, I've been silver for many seasons and I can safely say I have never been placed with gold players, you never go to a gold game where there's one silver 4 or 3 player with a bunch of gold 1-2 players because that would be unbalanced especially when on the other team there's no silver player.

Heres how my last game (wich was horrible) got matched

MY TEAM: Top (me) silver 4 Jungler bronze 3 Mid silver 3 ADC bronze 2 Support silver 2

ENEMY TEAM: TOP silver 4 Jungle silver 4 Mid silver 4 ADC silver 4 Support silver 3

You see how the enemy team has NO bronze players all of them are silver, yes four of them are silver 4 but do I have to mention the difference between a bronze 3-2 and a silver 4 player? well believe it or not it's a huge difference. And more than having bronze players in my team what bothers me the most is that the matching system doesn't place bronze players in the other team also.

And I would really love to see somebody at Riot explain to me how this game in particular is in any way balanced matchmaking because if you had to bet let's say 5000 dollars on a team I'm sure most of you would of placed your money on the enemy team.