Harold has freedom of movement, just as you and I do. If Harold can afford to live in a neighbourhood where tattoos and piercings guy can’t, who are we to stop him?

The real problem with gentrification is the unearned increase in property values that accrue to owners and not renters. This could be solved with Georgist land value taxes [1].

[1] https://en.wikipedia.org/wiki/Land_value_tax