Whilst America’s central values around freedom are for the individual, this means that the individual is also responsible for how they exercise their freedom.
To whatever extent the criminal suspicion surrounding George Floyd goes to, it is evident that there was at least some grounding for the police arresting him. This analysis is not a justification for his murder, but at best an explanation that attempts to look at whether Floyd's death is the best example for activists and reform.
Freedom is essential, but its abuse has consequences, and they uphold a moral society which is safe for as many people as possible. Moreover, whilst the principle behind the BLM protests are entirely justified and come from a desire to fight for equality, some abuse the opportunity and choose to commit criminal acts and therefore tarnish the name of the movement.
When someone breaks the law, there are punishments to deter others from also breaking them. George Floyd’s death was not justified, but the reason for his arrest may have some legitimacy.
Ultimately, America’s values are not contradictory, and the only responsible way to exercise freedom for all is to have rules in place that prevent people from abusing this freedom.