Supports are probably the main reason why damage is such an issue. (Low ELO perspective)
Every single support is a mage, or an assassin, or another ADC (literally in Silver/bronze), or something that isn't a traditional support. And it doesn't matter if it's a traditional support. Unless they pick a tanky support, nobody builds support items anymore! Why take a little bit of utility to help the TEAM, when you can take your giant-ass silver 4 ego and try to singlehandedly carry the game as a role that isn't supposed to carry?
If everyone played support normally and built support items normally, then I think that the damage problem would be a lot less, especially in bot lane and in teamfights, since supports could use their items, shield more, heal more, cure CC, etc.
But nope, let's just play full AP Veigar support, not even bother with a support item.
Rant over.
and
all build Support items. If they aren't doing that then they aren't playing the role correctly. They've stopped supporting and have just become another mage/DPS.