My answer:Meditation works to purify your mind. We all have thoughts that we don't want to have - emotions that we don't want to express, etc. No yogi wants to be an angry person. So, in the past, when this type of thought started to form, we suppressed it - much like sweeping dirt under the carpet. But, meditation is like an intense spring cleaning - you pick up the carpets and give them a good shake. All of the hidden 'dirt" come out. I think it is a necessary part of the purification process. However, it doesn't mean that you're supposed to bite your husband's head off - learn to witness your own thoughts (and emotions) in a detached manner. Observe the negative thoughts, but do not act on them.
Yoga Sutra, verse 1.12 abhyasa-vairagyabhyam tan nirodhah
"vrittis may be controlled by abhyasa (regular steady practice) and vairagya (detachment)".