Okay here's how I see this, the Draven leaving part aside, which I imagine there was some rage over.
If you are losing, then there is always a chance for a comeback. Yes, it may be difficult or near impossible, but any game can be won for a number of reasons. It is a ranked game, everyone wants to win. If you surrender, you guarantee you have NO chance of getting that win. If you battle it out for an extra 35, 40 minutes, but you GET that win, it was definitely worth telling your team they can't surrender yet. And even if you lose after that, you were going to lose anyways then, so you didn't really lose anything except time. Unless you've got a date or something to get to, it's not really a big issue. Either way you were going to spend that time in game, so maybe you won one instead of lost two. Or lost one instead of won one and lost one. It happens, time isn't that valuable that how you spend thirty minutes in a game should matter to that extent.
Just my two cents :3 People care about little things too much.
Side note: There are some games, though, where surrender should be done. When the team is fighting itself, and you're behind, there really is no point, they won't coordinate enough to make that comeback. It's important to know when you are soundly beaten, and it is unreasonable to try for that win.