You're right. I don't want to leave people thinking that non-profits are always right and should never be questioned or given outside advice. Perhaps that language was overly strong.

Is there a modification I could make to improve it?

I thought the way I phrased the whole sentence made it context specific

Don’t try to out-think the non-profits you support - they wish you were donating now, not just later.

But I could see how it could be construed to be making a broader statement than I intended.

Maybe it could be:

Don’t try to out-think the non-profits you support in this specific way - they wish you were donating now, not just later.

Don’t try to out-think the non-profits you support like this - they wish you were donating now, not just later.

When it comes to donating, don’t try to out-think the non-profits you support - they can likely do more with your money in the present.

Don’t try to out-think the non-profits you support without talking to them - they probably wish you were donating now, not just later.

EDIT: Changed in article. What do you think?