If it's happening often, perhaps you should evaluate your decision making.
To the point though, there is actually ONE VERY GOOD reason for not roaming towards a fight/skirmish. If you can't get to a fight early enough to turn it, or to at least get clean-up kills, it's a terrible decision.
Few things frustrate me more than when I get caught out of position (say, trying to ward the enemy jungle) and I face near-certain death, I try to run and juke skillshots (they're going to have to EARN the kill, if I can get them to blow any flashes / ultimates that's a bonus) and then I see one teammate run towards me to try to save me, then I die as they arrive and a second teammate runs to try to save them, and so on. One certain death turns in to 2, then perhaps 3, maybe even 4 or 5. There is a time to CUT YOUR LOSSES.
Second point, if I see a teamfight/skirmish that I know I can't get to in time / turn around / get clean up kills on, I'm not going to go to it. So why are teammates mad at me for taking a turret or dragon while their team is distracted? Sometimes, the best result you can get is TRADING OBJECTIVES. In the end, even if a turret and 2 kills give the same gold, the turret is better because you need turrets to get the nexus, not kills. If a dragon giives the same gold worth of stats, you're denying the other team that dragon and giving your team a chance to get to 5.
Anyways, I don't know exactly what your situation is, just trying to help ;)