Tank role and enemy CC

Should tanks walk into enemy CC just so the squishies don't get hit? This is something people and I usually seem to disagree on in-game so I wanted to discuss this out of game a bit to see if I could get other people's point of view.

This mainly applies to skillshot CC like Dehaka's tongue or Kel thuzad's chains, can't really expect anyone to dodge point-and-click or AoE CC. I only play ARAMso this also might only be an ARAMproblem but basically I was playing as Arthas and I would frequently dodge tongues which would lead to the squishy behind me getting tongued. The squishy (can't remember what they were playing) complained that I should really be the one eating the enemy CC and I suggested that they learn how to sidestep.

In my eyes, the tank's role is not to act as some CC sponge, especially in this case. I can see the benefits in eating a CC if a squishy is about to get CC chained just to break the chain and allow them to escape but I don't see the point in me just walking into all the CC especially if there is no team fight going on. Pretty sure if I got tongued, especially in the early parts of ARAM, I'd just get dragged back to their tower and killed. Whereas if we both focus on sidestepping the CC we can force advantageous engagements where we're both high health and with our cooldowns. As opposed to me getting dragged to the tower and having to pop every cooldown just to avoid dying.

Now of course there are some exceptions, if I have Ghouls and I see Dehaka looking for a tongue I'll try to get him to tongue one of my ghouls, if I'm Mei and Kel Thuzad is looking for a chain I'll walk into it and unstoppable. But I really don't see the point in me acting like a CC sponge in the poking phase of a team fight.

So, should the tank act as a CC sponge or is it everyone's job to watch out for CC and insure their own survivability? I say it's everybody's responsibility to insure their survival and the Tank is here to help in case you slip up/get dived and create good engagements.