Many people in the U.S. see nothing wrong with "logless access" as a way of avoiding law enforcement, when it is practiced in other countries whose law enforcement can -- including within the scope of their laws -- be quite abusive.
What makes you think your law enforcement is different?
And, with data potentially held in perpetuity, any past action may become grounds for prosecution, depending upon how law at the time of prosecution is defined.
People in the U.S. -- mainstream, as opposed to "minorities" -- have spent that past couple of decades waking up to the fact that laws and law enforcement are tools, not paragons of virtue. And those tools can be and are used for evil and harm.
This may not mean turning your back on the system -- nor even having the opportunity to. But it can mean being proactive to limit your exposure to potential abuse.
Not to mention all the commercial interests, who would love to have those logs. And, if your VPN company gets sold, including if it goes bust, all those logs become "assets" that will be monetized, regardless of any "promise" that was made. If there's enough value in them, lawyers will spend time and energy breaking any contractual obligations to same. And it's not like the company itself is around anymore to take the other side in such a dispute.
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P.S. A bit of personal perspective: I've taken to using a VPN all the time -- as opposed to just while on public WiFi, like I once did -- to a) Keep Comcast out of my browsing, both their monitoring and their JS injection; b) Keep Verizon out of my mobile data use, again both monitoring and injection (that header they keep wanting to inject for tracking/advertising, among other things).
HTTPS is finally becoming widespread enough to prevent some of this, but that change has come years after the above abuses started. And it still doesn't mask domains, nor inappropriate GET's.
Good security isn't just reactive. It's pro-active. Another precept is to always provide minimal information to get the job done.
Anyway...