Thanks for this comment Autarch. On reflection, I wrote that paragraph way too harsh. I've redrafted it now to reflect the reality of yours and other comments like it.
I'd be very hesitant for people giving money on my behalf to charity as well. Many charities seem to mismanage money in a big way, for example by spending lots of money on marketing and paying the leadership big salaries. From other charities I might find their agendas often questionable (Oxfam Novib, Amnesty) or I don't agree with their methods (Greenpeace).
Of course there are some decent charities to be found as well.
Other people might object giving to charities for other reasons [0].
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