Play to win is only legit if you play with your friends/team.
If solo/not 5, just play for fun.

Dota is primarily team oriented game.You dont need a pro to win, but one noob could ruin it all.

If there are feeders, to avoid stress, forget about winning for a while and focus on other goals like killing a specific hero/farm specific item.
My usual actions taken when there are feeders:
-mass bracers
-draw 'do not cross' lines
-form a 3 man farming unit (usually give the carry last hit)
-counter by baiting tower divers around tier 2
-in the extreme cases, forget about defending tier 2, focus on rallying team to defend tier 3 with 5.