Is it wrong that my cab was talking on the phone while driving and I tipped him?

I've been taking cabs a lot lately, and there is a guy who regularly drives me. As he was driving, he got two calls, so he was talking while driving. I still tipped him $5 just because I didn't want it to be awkward because chances are he will drive me again. I'm afraid that he will think talking on the phone while driving is okay.

Is it wrong that my cab was talking on the phone while driving and I tipped him?
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