I agree with you completely. The problem is that they at secondstrade.com don"t want to admit it because it might have been their operational system error or malfunction and due to that they need to compensate a lot to the users that lost their trades. As concerns blockchain.info wallet I must say it"s a very respectable online bitcoin wallet and I see no reason to change it. I"ve been using this wallet for several years already and did not encounter any problems with it during all this time.
The real problem is that they at secondstrade.com have started to accept the trades with  huge delays (up to 20 or even more seconds) since yesterday (this never happened before) and they try to avoid responsibility for doing that by means of denying any refund requests from users, that lost their trades due to the acceptance of the trade by secondstrade.com.
If the bet was received for example at 08:40:45 to their adress there is no way it is accepted by them 10 or 20 seconds later. Such transactions are 99.9 % will be lost by traders because of the market price volatility. In other words, the CFD market will never wait until the bet is accepted. It is continuously changing, every single second here counts.
So, to be absolutely fair with the users, that lost their trades due to this reason, secondstrade.com must compensate them their lost trades.