Of course, the alternative is without the bollards, drivers will drive where they shouldn't be going.
One of the worst cases was a person who intentionally drove a truck on a bike path in New York killing 8 and injuring a dozen
Although, most cases end up being a major annoyance without injuries.
There are a few places around here with full-width gates, and a small gravel path around the gates, sometimes requiring navigating around large rocks placed in the way. Oh, I'd prefer having the bollards. Or, in some cases, NOTHING.