Karen the second most hated character?

To be fair fans don't really like her and why not she's a home wrecker, a cheat, reckless and someone who's unapologetic for her actions even if they harm others such as kicking Mandy out at worst possible time, or killing her baby or *beep* Joe while he was beating Mandy and then taunting Jamie yet the main characters continue to except her back into their life knowing she probably do it again without regrets