Jesus warned his disciples to watch out for deceivers claiming to come in his authority. That's all he told them to watch out for. Indeed, the disciples were already hearing those deceivers. These deceivers would be pointing to events such as wars (etc.) but these were not indications that the end is yet.
Nowhere does Jesus say they would hear about big wars, many nations, lots of casualties, etc., etc. He only said, "you will hear about wars BECAUSE nations and kingdoms will fight". The 1914-1919 Great War was not the first time there was a war! Relatively speaking, it pales in comparison with the 30 years war between France and England, and it also pales when compared with WW2 of 1939-1945.
The GB/WTS cannot point to 1914 as a turning point in regards to other disasters (earthquakes, famines, disease, etc.).
Nowhere does Jesus use the word "increase" (or similar).
Nowhere does Jesus says "there will be an increase in the number or casualties from earthquakes, in the number of earthquakes, or in their intensity". No, he just said you will hear about these things, but what you need to watch out for are the deceivers.
If these days are really so bad, in which age would you prefer to live, and why?
And CTR consistently expected 1914 to usher in the period of unprecedented PEACE. When every one of his expectations for 1914 failed, the WTS amended the word "before" to read "after", and kept selling his books. CTR said it was a marked year, but it was marked for peace. He did not use wars as a sign.