Why is it that when conservatives are blamed for a problem, why are there people who say both sides are at fault?

Why do they have to bring up both sides instead of just admitting Republicans are at fault like for Jan 6th coup attempt and Donald dork trump for making it fashionable to be an open bigot against gay people and minorites and yes the majority of the blame belongs solely to Republicans ever since Jan 6th and trying to suspend the constitution, Republicans are not the party of Lincoln but the party of the southern democrats now Republicans since Nixon's southern strategy.

Why is it that when conservatives are blamed for a problem, why are there people who say both sides are at fault?
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