In case you didn't know about this scandal, UK cops infiltrated activist groups, and, in addition to spying on them, fathered children with unsuspecting members. The investigation and fallout are ongoing.

Hence why people might be upset that UK-based Raspberry Pi proudly and enthusiastically hired an ex-cop who used their hardware to develop surveillance technology during the same time period as the scandal, and chose to highlight that career experience.

https://en.m.wikipedia.org/wiki/UK_undercover_policing_relationships_scandal