As outlined in a separate comment in this thread, your solution is unenforceable unless you want to erode some pretty fundamental freedoms. THAT'S evil. No, wait...it's not evil. "Evil" is a gross oversimplification of things. It's anti-intellectual and avoids any sort of meaningful discussion of why people do the things they do.

You feel compelled to help prevent potential respiratory issues and cancer in children exposed to second hand smoke by policing what people do in their own homes. But in the process of policing this issue you potentially do more harm than good - how do you solve the issue? Fines? Makes the family poor. Criminal record? Makes the family poor. Take away the children? Your intentions are good but I can only see the medicine being worse than the malady.

I just suggested that risking lives should be viewed as more than just 'a dick move'. Cutting in a school lunch line is 'a dick move' dumping lead into a towns drinking water is worse than that.

PS: We used to think beating children was ok so times change even if few people in up in prison.

I did put words in your mouth but the implication of your original comment, that smoking around children be banned in the home, was that there would need to be some sort of policing of this activity. To police an activity in an individuals home we need to impinge on some pretty important freedoms. So we have a choice - a severe nanny state where we address shitty behavior on a case-by-case basis or teach people to be more thoughtful so that we can prevent shitty behavior from the outset.

PS: We used to think beating children was ok so times change even if few people in up in prison.

Sending a parent to jail for beating their child is wise because beating a child imperils the child's life. On the other hand, sending someone's parents to jail for smoking around them will be more damaging than exposure to cigarette smoke. The medicine is worse than the disease. What's more, you assume all people are rational actors which we know is fantasy - just because some people have gone to prison in the past for some random transgression won't be enough to stop another person from doing the same.

Even though this unfortunately isn't the case, jail should only be used to separate violent people from the general population - there are far better methods for dealing with non-violent offenders, chiefly community service or a fine.

Also, if you have 10 equally valid issues at a national level. Then 100% fixing one of them almost impossible and probably extremely expensive where making a 20% dent in all 10 of them is more valuable and probably far less costly.