You state that Validator nodes have no power and it is a myth that they have any impact on the network.
Sorry. dinofelis is correct. Non-mining nodes have essentially zero power of enforcement.
When faced with a block, a node has two possibilities. It can accept that block and forward it, or it can consider it an invalid block and not forward it. That is all. What it cannot do is prevent that block from getting to another miner that is perfectly happy to create another block on top of it. If miners are extending the chain, demonstrably accepting those blocks by building other blocks atop them, there is doodly-squat that non-mining nodes can do about it.
apart from consider it an invalid block and not forward it.
And nobody NEEDS that node to forward it. You can get it directly from one of the miners.
Of course, if nobody is needing the bloc all together, the coin is worthless. But there is no alternative chain where the coin isn't worthless. So a USER can decide that he doesn't want this bloc chain, that he doesn't want these coins (and lose everything he has on it). Or he can decide that he will use the only chain in existence. But no non-mining node can stop a USER from having that block chain, use his wallet and send out transactions: directly to a miner node if necessary. A crypto currency is a relationship between miners, making block chain and selling it to users, paying for it in the market. What non mining nodes may say about this block chain, doesn't really matter. Of course, what users are wanting to pay for it, does, but they can only use the chain or the chains made by the miners, or decide not to use the coin at all.
If no user values the coins in the market, the miners are making a worthless chain. But they make this one and no other one in any case. And if users want to value coins in the market, they don't need your node forwarding the blocs, they get them directly from the factory (the miners).
So what is your non-forwarding node going to do about that ?