Stay smart or follow my team off the cliff?
There have been a ton of games recently, where I'm top lane (or other lanes) and I'm doing well in my lane and ahead once we hit mid game and then start having to group. I usually get this this point by staying disciplined and patient, farming under tower when needed and not taking any uncecessary chances. However, once we start grouping, my team mates make a tons of mistakes like getting caught out, staying too long or getting caught by enemy cc, going for an objective like baron or drag at the wrongest time, etc. Then as the top laner, tank / semi-tank, despite my better knowledge, I dive in to save them and get rekted. I even realize this is probably not the smartest thing to do as I'm doing it...
I've heard the advice for team games that "everyone doing the sub optimal or not smart play 'together' is better than everyone off doing their own thing", but is this really true? I still think it applies at some levels and in some situations, but I'm sitting in the middle of Bronze right now and just hate throwing away these games that I do so well in and that we are set up to win, just because of a few dumb mid game mistakes where I went in against my better judgement.
Advice? Others that share the same woes?