They could have it so that if you have already pulled the pin on a nade, it will still drop and blow up. Otherwise it's retarded and I hate it but I admit I use it since so many other people do.
Thats why they are called perks, its a benefit to the player and adds competition for his, or her, enemies. Learn to react to these perks and never rely on the same tactic, adapt and survive, or fail miserably.
I just play on servers that ban martyrdom and last stand. Some guy gets shot in the back with a rifle and instantly turns around with his Deagle blazing? Please.