Charity alleviates the symptoms caused by an unjust system but doesn't challenge the root problems, and it often puts those providing the charity in a position of power OVER those who it 'helps' with benevolence or feeling good for helping out.
Solidarity, on the other hand, implies that our struggles are intertwined. I support you because we all benefit from it and I hope that you will support me also. Solidarity can challenge the current systems while still providing essential service work.
So for example: we can feed the homeless (which is important) or we challenge the economic, political, and social systems that cause homelessness through real education, real jobs or real job training, and decent housing, or we can do both at the same time.
Charity and solidarity are NOT mutually exclusive concepts. It really comes down to the analysis and how you administer the programs. In the 1960's churches had fed people for years, but when the Black Panther Party, the Young Lords, or the Brown Berets began similar programs combined with their analysis and actions that challenged the systems, the service work became deeper in solidarity with those who were historically marginalized in our society.
Charity alone is a relief valve for guilt from not having to
challenge oppression. Solidarity says we must challenge this system and
provide for people so we can make the world a better place for all.
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As for the question "how do you know who's a bike thief?", the simple
answer is that those we ban are people who have been seen or caught by
us stealing bicycles around town, sometimes multiple times. These
aren't criminal masterminds but opportunity thieves, transient drug
addicts who roam the neighborhoods begging and scoping out houses for
stuff to steal. The next question I anticipate is "Why don't you call
the police?". Well, if we can get bikes back, we do so ourselves, but
most of the bikes are sold quickly on the street or traded for drugs.
Calling the police is pointless, it's not high priority and jail time
unlikely for a single bike etc, etc. We don't have a solution, but we
know from experience that the police are not that solution. You won't
find many Austin cyclists with good police-related experiences.
Simon