Stevenage manager blamed three individual errors as the root cause of their loss to Bradford City.
Boro were looking good at half-time after Carl Piergianni had headed them in front but two goals in the opening 10 minutes of the second half put them behind.
And although Dan Sweeney equalised with 17 minutes to go, Bradford scored on 86 minutes to seal a 3-2 win.
And Evans felt it was the scorer of Boro's second goal who should shoulder the blame for the goals against.
The boss said: "It was very similar to Northampton wasn't it? We were in command for long, long periods but if we defend like that, individually, we'll get beaten every week.
"Dan Sweeney deserves enormous, enormous credit for us but he has cost us with three errors and three goals.
"He knows it and he's in there disappointed. He's a true rock for us and he will bounce back from that."
The first goal against saw Matt Derbyshire thump a looping effort in off the bar and the defender conceded a penalty which Andy Cook scored.
The third, from Jamie Walker, came after a mistake from the former Forest Green man.
Evans said: "If you make big mistakes, it it's going to cost you, isn't it? We don't win a simple header on the edge of the box, Matt Derbyshire has played for me and his finishing can be like that.
"For me the penalty, and I've just watched it back it as I didn't see it at the time, it is a penalty. We don't get penalties but that one is a penalty.
"And if I go straight to the third goal, then it's just a simple mistake. We should clear our lines, we don't and we try and keep possession on the edge of the box which is the wrong decision.
"But there is a lot of things that have gone against us, again by the man in the middle.
"Should they have a player sitting in the dressing room? Yes, he should. He's been given a yellow for denying a clear goal scoring opportunity.
"We've hit the bar and we've scored a perfectly good goal because I've looked at Josh March's effort. It is a goal, it is behind the line and we don't get it.
"The linesman's called it correct this side for Bradford because it is over the line. Ours is over the line and he gets it wrong but that's what we have to endure."
And he refuted claims that Bradford had done a job on them with the smash and grab victory.
He said: "I don't think they're doing a job when we're 1-0 up, in command and we should have a couple of penalties. I don't think they are in command of any situation then.
"I don't think they are in command of the situation when they should have a straight red.
"But credit to them, they dug in and got the result.
"They are a big club that should be winning and shouldn't be sitting whatever it is behind us. And they've got good players and an experienced manager.
"So we'll take the hurt and channel it."
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