Compassion, respect and reverence for all living beings is not easy to always accomplish. And there are often shades of gray. After all, roaches are known vectors for an increase in symptoms in asthma sufferers. So is saving a roach worth harming an asthma sufferer? Roaches also increase pet rat lung conditions. So do which creature do I revere?
What I think is the most important is the awareness such questions require of us given our knee-jerk reactions and unconscious responses to most things. I don't go out of my way to kill cockroaches. I do my best to keep them from even coming into my home. If they do, honestly, yes, I do try to catch them and release them off my property. Sometimes I can't and with both myself and my partner being asthmatic and us having a mischief of rats, I do have to kill them. Life contains suffering, illness, and death. Every day, those experiences occur and are made conscious in our minds. What do you choose to do with that awareness and knowledge is what makes us ultimately compassionate human beings.
Great question really. Thanks. 
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