if you think deep into it & realize you know something its a very sad (rather now during sefira or in the 3 weeks) with very bad things happening during this time. then you will not have a hard time admitting & saying to yourself you know something? Hashem is right, I don’t belong at weddings & listening to music etc… at such a sad time. I should feel the lack of happiness (no need to be a mourner but you should feel the difference)
BOTTOM LINE: when a person realizes this then all the halachos to keep are so easy & its nothing to keep because its a part of you now that you’ve realized the truth & reasons behind these halachos.