If someone dies to minions or turrets without assistance of champions, he doesnt give away any gold or experience, why is that so?

if 3 champs tower dive you and you had no chance to deal any harm to them and one of them dies, wouldnt it be fair to get something out of the death? in dota the cash is split between the team, the one who dies looses gold and gives away gold, in LoL there are no penalties besides waiting for respawn if you die on a stupid way - no gold loss, no feed.
There should be a penalty for dieing like that, dont you think?

Some players abuse this to deny the gold and exp in hopeless situations, which is smart, but the fact that there is no loss in doing this, makes no sence to me.
Turrets and minions usually contribute alot to kills, even if they make the last hit, you profit from it, but if they take someone out on their own, you dont get any share, even if theyre your allies

Edit: im talking about the teams minions and turrets, not neutrals - getting killed by neutrals should not reward the enemies, just if they die to THEIR minions or turret

Why should anyone be rewarded for not contributing?

I kinda agree that a execution should split the gold among the team but a I think that a humiliation (killed by neutrals) should remain the same.

Well, a point to note is who would it give gold to? Sure, you could say the one they attacked, but this wouldn't work out very well if no one was attacked by the person executed. If you say to the entire eam, then this ruins jungle strats like Eve-Revive. I agree, it is annoying to fight off two people at the turret, focus one, kill that one, only to have the other executed and get no gold for it, but this is not the solution.

If a melee champ tries to tower dive you and you manage to run around your tower long enough for them to die, then your actions did contribute to their death even if you dealt no damage.

YES TAKE THAT JUNGLE EVE SMITE REVIVE AINT SO PRO NOW bump support

Because managing to get executed instead of slain when you're being chased through the enemy's jungle is an awesome feeling.