Killing as a support?

Just played a game where multiple take downs were lost because I didn't want to face the wrath of people screaming 'KS' at me. To note, the kills weren't me 1v1ing, it was me and someone else trying to kill them, so in essence I stopped attacking to give them the kill and then they got away, if I had carried on hey would have died. So my Q is, should I just attack as a support and not worry about who gets the kill? Or should I try to give it to my ADC/team no matter what even if it means they may get away?
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