Up to a certain age you can have that excuse, most people start off being leftists because that's what our jewish media tells us is "the good side". They tell you niggers are just like you, they tell you fags just want to live their lives, they tell you women are just as strong and intelligent as men and anyone who opposes these ideas is cartoonishly portrayed as stupid, evil, ugly, rich and white with no real facts to back up their ideas, they're just evil and hateful for no reason.
But yeah after age 25 or being directly confronted with the evidence that all of this was fake jewish propaganda, that the left is blatantly anti-white/male/straight/christian and filled with hypocrisy you no longer have that excuse and you're just a piece of shit virtue signalling conformist.