Huge Problem in a Lot of Players

This has nothing to do with my recent games but it's a trend I've noticed. A LOT of players tend to do this, thought it'd be good food for thought. Players over-stay all of the time. Tell me how familiar this sounds.

THE MISTAKE

1. Your team consists of a large quantity of melees and has poor sieging ability.

2. Your team just got 2 or 3 kills on the enemy, all went mid and tried to force tower. Because of the number advantage, you secure the tower.

3. As a result of the forced play and ensuing teamfight, your team is fairly low on health, and because you haven't backed yet, the gold advantage doesn't yet matter.

4. Your team decides to stay mid and continue pushing rather than ward the enemy jungle to prep for future plays (Free vision advantage), secure dragon while they push the accumulated wave back or simply return to heal and gear up.

5. The enemy team respawns with their new items and mops up, getting 2 kills for free.

6. Now with a number advantage against wounded enemies, they force a tower for free.

I see this type of situation all of the time, and I never really understood it. If you cannot realistically take a tower down, why line up mid and walk back and fourth outside tower range? All you're doing is risking death. That's just it. You have a high risk and extremely little chance of reward. It makes so little sense that it mystifies me that it's so prevalent. What do you hope to gain? There's NO WAY you're sieging that tower. Go make a play somewhere else, or at least go after an outside tower instead of that inner middle,...