As a support main, I have carried a number of ADCs, and I've seen others do the same. Now even though we may not end up with any kills, we do a different type of carrying. Like building 5 active items to save an ADC because they feel like 1v3ing the enemy jg and their bot lane, then taking the death for said ADC so they can just barely win that fight and come out with 3 kills.
Then there are times that our ADC is too oblivious and has no map awareness whatsoever, never engaging when we set them up perfectly for a double kill, or ignoring the vision from the 4 wards we've placed on all entry points to bot lane and then getting ganked. Usually at this point I build AP carry or bruiser (depends who I'm playing) and I carry their ass the hard way.
Now I'm not saying all ADC mains are bad, but I've come across many who take all the credit, don't appreciate their support, and then claim their support was useless. People seem to think most kills=person carrying, but that logic is false. Good support mains carry all the time, and they do it without kills. All those clutch FoM actives to save a teammate, all those Locket actives to negate damage to your entire team, the many wards that grant vision when everyone else refuses to buy a SS/lvl 9 trinket, all the skillshots/executes we've face tanked to save people, all the times we bought Mikhael's Crucible to cleanse cc from a squishy person, the list goes on. So if you truly believe you're better off without a support, then good luck to you when your support leaves you to 1v2, and good luck affording all those ADC core items when you have to spend all your gold on potions, wards, and anything else that a support would typically take care of for you. ADCs can feel like a weight around our ankles too sometimes, but unlike you, we throw that weight over our shoulders and take it to the finish line or die trying.
As for the ADC/any other lane mains that appreciate their supports, even when we screw up or things don't go as planned, thank you!
-Vaz-