Why are so called moderates quick to defend republican conservatives but do nothing to defend liberals and even join in the criticism?

when conservatives are under fire from liberals, moderates are quick to defend republican conservatives but almost say nothing to defend liberals and some join in the criticism and even share their so called distrust of liberals so much for being a moderate if you join conservatives in attacking liberals.

Why are so called moderates quick to defend republican conservatives but do nothing to defend liberals and even join in the criticism?
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