TLDR
The idea of incentivization is to penalize both sides by penalizing both sides. Casper’s philosophy is this: for all four categories of attack, we want to put an upper bound on the ratio between the amount of harm suffered by the victims of the attack and the cost to the attacker. The first two attacks, Finney attacks and feather forking, are costly because the attacker risks their blocks not getting included into the chain and so loses revenue. If the attacker is a majority, however, the attack is costless, as the attacker can always guarantee their chain will be the main chain.via the TL;DR App
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