I don't have any genuine spite against them and I don't think its a useful feeling (at least for me) to have. Its an act to manipulate forth a specific response from a specific demographics that share some of the same personal characteristics due to a shared culture/understanding.

If they regret/repent, they might start to think of ways to change things. If they deny their wrong doings (ie. ever being pro immigration), they might stop spreading anti white rhetoric.

I have never blamed any boomer directly, but have blamed them indirectly by blaming other boomers. This gives them an escape. "I never supported that", "I am not like those guys that you don't like". (Basically, "I am not a racist" psychology)