People can be toxic for whatever reason, remove deaths and they will find another like "Boohoo your score is low, l2p, ez, noob" or whatever.It was done in an effort to improve the general atmosphere (reduce toxicity). Myself and I am sure you too would agree that creating a welcoming environment for new players is one of the aspects that leads to a healthy player base that fuels both casual and competitive modes. But we recognize that this statistic is important in many ways if you're competitive, wish to improve your skills, useful for comparison in tournaments,...
Reducing toxicity rarely can be done by game redesign, that "responsibility" lies within the game community on how it reacts to toxicity and if it rejects it or embraces that. That is real life RNG since you never know how community will turn out and it can always suddenly go bad for no specific reason at all.