For example, how does, "rent-control => neglect the state of housing" That happens already without rent-control.
1) It incentivizes the landlord to shorten the amount of time a particular tenant will inhabit the property, because it is only when a tenant leaves and a new one comes in that the landlord is free to jack up the rent to market rates.
2) It compels the landlord to lower his expenses in order to ensure that his investment stays profitable. Ordinarily, a landlord is constrained by a desire to keep a property that will attract and retain good tenants, but since that is no longer (as much of) a factor, he will avoid making repairs and enhancements except in emergency situations where the law requires him to.
Source: landlord (albeit one who has never worked in an area with rent control policies)
Perhaps another example: the drug war. Making marihuana illegal creates criminal activity other than just selling it. You could say "okay, so just police that", but that's not so easy in the real world, and we've seen the negative consequences of attempting it.
A lot of problems would be solved if politicians thought less about the intentions of their policies and more about the incentives those policies create. Too many policies make bad behavior rational. Even worse is that once you do that it's not just that good people start behaving badly, but also that bad actors out compete the good ones. A good policy aligns self interest with the common interest.