I’ve probably mentioned this before, and if you haven’t heard it from me, hopefully you’ve had someone in your life who was crazy enough to say it.
In most cities (every one that I’ve actually seen the statistics compared), there are more abandoned housing units then there are homeless. That is to say specifically, there is enough housing for everyone. Of course, the red tape of our society usually prevents this solution from becoming a reality.
Also, in most cities, even if we are extremely conservative with our statistics, there appears to be many Bible-believing church-attending “Christians.” And of those Christians, even with conservative estimates, I would guess there are many more empty “guest bedrooms” in those homes then there are homeless out on the streets.

Even with this reality, we have plenty of excuses as to why my correlation (The “Christians” [who are supposed to practice hospitality, see Romans 12] with Empty Guest Bedrooms : Homeless Ratio) simply is not appropriate or feasible.
“Many homeless have mental conditions, that would make it unsafe for my family.”
“Most homeless have drug and alcohol problems which would put my families lives in danger.”
“And God calls us to protect our family and be wise” [sidenote: Can someone please show me where in the Bible it say that to “protect” our family is a top priority?]

LAME EXCUSES!
We have within our means the ability to radically live out the Christian calling of caring for the needy and practicing hospitality, and we are content to pass off some lame excuse.
Here’s why it’s lame. Keeping your family (and the people on the street) safe is a wonderful thing, really it is. Mental conditions should be treated, drug and alcohol problems should be controlled, nobody should be hurting or threatening anybody; but what does that have to do with opening your home to someone else?

Let me just cut to the chase. You are to be validated in your concerns. But, now it’s time to problem solve and find a solution for bringing together your desire for the well-being of all, and your calling to radically follow Christ.
If people (including many Christians) can spend thousands of dollars solving the problems of remodeling their outdated bathroom, or upgrading to a state of the art kitchen, then I think we can also put our minds and money to creating homes that can accommodate those who need a place to stay.

Maybe you put an outside door on the guest room and a regular locked door into the house. Or you remodel the office or the space above the garage to have not only a bedroom but a bathroom and a small kitchenette.  Use your imagination, you could go more elaborate or more practical, but look to solve problems rather then make excuses.

Maybe for some it means downsizing their home till it accommodates the basic needs for their immediate family and they then use the freed up additional wealth and resources to contribute to a community that is meeting the needs of the homeless.

Stop making lame excuses that justify your apathy to following Christ call. Instead have some fun and remodel your house (and in doing so open yourself to following Christ in ways you’ve never considered before)!