I’ve had moderate success by using a handful of quotes over the years whenever this topic comes up with friends or family.
“Arguing that you don’t care about the right to privacy because you have nothing to hide is no different than saying you don’t care about free speech because you have nothing to say.” - Edward Snowden
This quote can substitute out the “free speech” bit for “gun rights” if you are talking to a gun nut.
“I like to close the bathroom door when I’m taking a shower. It doesn’t mean I’m doing anything immoral in there, I just have the right to privacy.” - Anonymous
A fair followup question when they say “why bother, it’s pointless anyway,” that might provoke some thought on their part is: “Do you ever make any effort at all toward a goal that is ultimately a drop in the bucket? Have you ever recycled a single plastic bottle? Covered the PIN pad when entering your PIN number at an ATM? Walked to the store instead of driven? Written a letter to a congressman? If so, why? The overall effect of your action was probably negligibly small in the grand scheme of things, so why did you bother to put any effort in at all?”
The answer to that question is: just because you can’t get to 100% privacy/eco-friendliness/whatever goal it is you have, doesn’t mean you can’t put in some degree of effort to protect your rights, the earth, or hold your government accountable.
They don’t have to ditch Google entirely in one day. That’s ludicrously hard and even privacy advocates like myself can’t do it easily. You take incremental steps when you are ready. Ditch Chrome when you have the bandwidth and get Firefox. Ditch Google search in favor of DuckDuckGo when you think you can deal with the different experiences. etc, etc. Everyone’s journey is different.
“Octopus’s Garden” by The Beatles seems apropos.