If helping them is in something that is halal and it doesn’t affect or harm you, you should help them

I wanted to know if it wrong to NOT allow people to use you? meaning you suspect that they are using you, so you do your best to prevent it, but you help them with what you can but don’t go to exceeds.

Psychological and Social Problems | March 11, 2014 5:38 pm
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I have heard from a range of people that Starbucks- this company that sells coffee, hot chocolate etc, funds the Jews to kill Palestinians. Should I avoid going to that shop to buy anything from it?
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I told my sister at night I will go with her in the morning to the train station to drop her off. However, in the morning she told me that I do not have to go, so I decided not to. Have I broken a promise here?