Support is probably the easiest role to carry with in Season 7

-You can shut down two enemies at once

-You can get your adc fed. Even if he's ''bad'' mechanically, a fed adc can still carry a game easily

-You have more control over vision

-If your adc is fed, you can roam and give a lead to your midlaner, or even your jungler with deep vision

-Supports are actually really strong right now, putting them in a spot that is on par with other roles when it comes to income

All of this, of course, assumes that you are actually better than both the enemy team and your allies.