When you live with an ideology long enough, it can take root in your mind and have a lasting effect.
Do you self-censor? Would you tell your coworkers what you think about immigration, gender issues, or evolution?
The men who translated Marxism into practical political terms in the form of Soviet terror were evolutionary thinkers.
Today the term Lysenkoism applies to any use of government power to enforce scientific orthodoxy.
If we treat criminals the way we treat natural disasters — as physical events without moral culpability — the pragmatic approach is preemption as well.