> people who take drugs
The majority of effectively homeless in the US are working people. This means people who dont own or rent any kind of housing. They crash in other people's places, frequently going homeless for periods. This includes working families. Their size is estimated in millions.
The chronic homeless are people who dont even have any place to crash from time to time. People refer to these people as 'the homeless', without knowing that a lot of the above category also enters this category frequently over any given year. The chronic homeless category also includes working people due to the skyrocketing housing costs, especially in major metropolises like NY, SF etc. This segment's size is estimated in a range in between 500,000 to 3 million, depending on whose research and criteria you take.
Drug addicts are also in this category, and the existing economic establishment prefers to identify the homeless with them in order to thwart any reform that could cause an increase in their taxes or disturb the real estate sector.
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So that's right - the problem is ideological. But maybe even before that, its economical - those who hoard the wealth dont want anyone to disturb them and their ever-increasing hoards of wealth with any pesky taxes...