Did i leave crag maga for the right reasons?

i wanted so bad to get into some kind of MA or self defense class and i found krav. the way the krav guy ran things just made me feel uneasy but maybe he did nothing wrong, thats why im asking you. he threatend one of the kids there, saying he was gonna kick them in the balls so hard they wont be able to sit for a weak and he looked angery. the kid was doing good in my opinion just maybe something was bugging him and he seemed tired fast. the teacher told the mother he thretend her son cause he didnt give his all. the teacher also bit one of his students and make a little triple of blood on him to demenstrate something.. hes always telling us hes trained to kill, been with the special forces and other killers, seen the most bizarre things ect..this is just a quicky of what im telling you, i felt uneasy around him and dint really trust him. he knows what hes doing not saying hes a bad person but that just wasent my style i guess... what do you think?