Depends on your champion picks and team comp. But trying to get objectives whenever possible will always help. Got a good split push comp? Make use of it ans punish those side lanes!
Got those lanes pushed up and drag is up? Go for it.
Good team fight comp? After lane towers are down, group up and wreck them!
It all depends on each game. Some are harder to close out cause they have good stall champions like Azir or Anivia.
For the specific situaton you described, if your team manages to distract them, go for a backdoor if possible. Try to use your team's stupidity to your advantage. If you can't do that, try to help with whatever objective it is they do want. Better to help your ream with a stupid idea and maybe turn it around than let your team all die while you don't get anything in return.