Most JW will give this same reason.
Why?
Could it be that they all concluded JW are The One True Religion based on the facts they observed?
Or could it be that they all think they concluded this, after many Watchtower studies that repeated over and over again that 1) love is the singlemost important hallmark of True Religion and 2) only Watchtower followers posess this true love?
It's also nice that whenever any other religion has some kind of quarrel among it's members, JW will conlcude it's a sign that love is lacking. Whenever JW have a quarrel, it's an opportunity to forgive and love. 'See, this is the only loving bORg!'